go mental

go mental

1. To become extremely angry or upset. My parents are going to go mental if they find out we had a party here! Don't go mental, but I think I broke your computer.
2. To become or feel crazy. I'm going mental being stuck in this cabin all week with my parents!
3. To act in a crazy, foolish, or reckless way. Too many kids start going mental when they go to college and have total freedom for the first time in their lives.
See also: go, mental
Farlex Dictionary of Idioms.

go ˈmental

(British English, slang) become very angry: My dad’ll go mental when he sees what we’ve done!
See also: go, mental
Farlex Partner Idioms Dictionary

go mental

in. go crazy; to act stupid. Another day in that history class and I know I will go mental.
See also: go, mental
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • mental
  • mental block
  • mental midget
  • straws in (one's) hair
  • schiz
  • schiz out
  • schizz out
  • be one sandwich short of a picnic
  • a brick short of a load
  • be one card short of a full deck
References in periodicals archive
Watch Newcastle crowd go mental as B*Witched sing Wilson Phillips' Hold On at Bongo's Bingo
Prosecutors said an officer took him by the arm and Evans struggled, saying: "I'm going to go mental in three, two, one..."
Six teenage girls with voices of angels reveal their mission to "go mental" on a trail of booze and debauchery in Edinburgh.
"It's like being plugged into an electric socket where you go mental.
They go mental and I take myself to bed." Wise girl.
"I've spent as much energy this past year trying not to go mental as I have plugging my record.
THE CABIN IN THE WOODS C5 9PM PREMIERE Five go mental in a monitored cabin...
HER name is Daisy Shah and she is reportedly the girl for whom Salman Khan will go Mental in his next film.
"I just get into rages - like when I'm stuck in traffic I just go mental.
Nathan Hogg, drummer and the youngest of the group, smiles as he tells me: "We just go mental on stage.
I go mental. I don't have the patience and I don't have the pants."
They'd have had the foresight to pack a pair in advance so they could go mental in the mosh pit without fear of contracting trenchfoot.
How was I going to explain "I can't go on tour again; I still want my job, but I need to go mental institution for awhile first"?
Kids didn't go mental if the latest Pokemon wasn't in their stocking, The Snowman (above) was one of the highlights of the Christmas schedule (these were the days when it hadn't been repeated about 40 times already), and the music of Phil Spector and Greg Lake filled the charts.
"When the camera was switched off I told him that it my job to look calm when what I REALLY wanted was to go into the dressing room and go MENTAL with the players!"