go mental(redirected from went 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.
go ˈmental(British English, slang) become very angry: My dad’ll go mental when he sees what we’ve done!
in. go crazy; to act stupid. Another day in that history class and I know I will go mental.