fool around

fool around

1. To play or tinker with something, often in an aimless manner. Hey, don't fool around with the thermostat—it needs to stay at 68 degrees. Grandpa's still fooling around with that old radio, but I doubt he'll get it to work again.
2. To engage in aimless recreation or frivolous time-wasting. Quit fooling around with the dog and work on your book report already!
3. To have a casual sexual relationship with someone. Betsy and I are just fooling around, which is great because I don't want a serious relationship anyway.
4. To joke about something. Often used in the negative to indicate absolute seriousness. Oh, come on, Tina, we're just fooling around. We didn't mean it. You guys, Mom is not fooling around. She said she would ground us for a month if she caught us again.
See also: around, fool
Farlex Dictionary of Idioms.

fool around

to waste time doing something unnecessary or doing something amateurishly. Stop fooling around and clean your room as I told you. I wish you didn't spend so much time fooling around.
See also: around, fool
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

fool around

1. Also, monkey around. Engage in idle or casual activity, putter. For example, Jim loved to fool around with his computer, or She was monkeying around with some figures in hopes of balancing the budget. [Second half of 1800s]
2. Engage in frivolous activity, waste time. For example, Instead of studying, he spends all his spare time fooling around. Also see fool away.
3. Engage in flirting or casual sexual acts; also, engage in adultery. For example, He caught the two teenagers fooling around in the basement. [1830s]
See also: around, fool
The American Heritage® Dictionary of Idioms by Christine Ammer.

fool around

v.
1. Slang To engage in frivolous activity; goof off: The children are fooling around in the yard.
2. Slang fool around with To manipulate or work with something without a clear purpose; toy with something: Who's been fooling around with my briefcase?
3. Vulgar Slang To engage in casual, often promiscuous sexual activity.
4. Vulgar Slang To be sexually unfaithful.
See also: around, fool
The American Heritage® Dictionary of Phrasal Verbs.
See also:
  • fool around with (someone or something)
  • fool with
  • fool with (someone or something)
  • fool about
  • screw around with (someone or something)
  • fiddle with
  • fiddle with (something)
  • mess about
  • mess about with (someone or something)
  • mess about with someone
References in periodicals archive
(Please don't fool around with it so that the responders from the Police (PNP), Fire (BFP) can immediately respond and take action.)
Liz Esnouf, commercial director for Arriva North East, said: "As the nights draw in we want to make sure children understand it could be incredibly dangerous to fool around on or near the roadway.
``We want local children to understand that although it may appear exciting to fool around on or near railway lines it is incredibly dangerous.
Kelly and Billy fool around on St Barts Pictures: GOFFPHOTOS.COM
Steve Noble, managing director for Arriva North East, said: "We want local children to understand it is actually incredibly dangerous to fool around on or near the roadway, both for themselves and for other people."
I think you need to be careful because the message you're giving to this younger man (and he's taking on board), is that you can 'fool around' but you're not in the market for a serious relationship.
"Some children might think it could be exciting to fool around near railway lines, but the reality is it is incredibly dangerous and could result in serious injury or even being killed."
Well, darling, it's called showbiz, and the game is that you fool around acting like an eejit, sounds emit from your mouth and people pay loads and loads of money to hear you and buy your CDs.
"With six weeks of free time we want local children to understand that although it may appear exciting to fool around on or near railway lines it is incredibly dangerous."