to waste time or behave in a way that is not serious.

We're not here to fuck around — we have work to do.

You're just fucking around with small improvements when we need to make major changes.

Usage notes: the opposite meaning is expressed by not fuck around:

Pat pulled out a gun and said, “I'm not fucking around, man.”

Related vocabulary: fool around

• not a red cent
• not bad
• not bat an eye
• not bat an eyelash
• not bat an eyelid
• not be a barrel of laughs
• not be a bundle of laughs
• not be a happy camper
• not be all beer and skittles
• not be all fun and games
• not be all it's cracked up to be
• not be all moonlight and roses
• not be all there
• not be a patch
• not be a patch someone
• not be a patch something
• not be a pretty sight
• not be as black as are is painted
• not be as black as it is painted
• not be as black as you are is painted
• not be as black as you it is painted
• not be backward in coming forward
• not be bag
• not be brother's keeper
• not be cup of tea