An act of stupid and mischievous behaviour, commonly in the form of a prank, and can sometimes be illegal.
1) Ed: Want to pee in the beer bong and get some gronk to drink it?
Anna: Yeah man! That's some high quality toomfoolery in the making!
2) Ange Autopsy: You guys made me look like a total idiot last night. *cries hysterically*
DM: Awww DUDE it was all in the name of tomfoolery!
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