When you have to fart and you have to clench your buttcheeks so you dont let loose, kinda like you slam on the brakes
The one slamming on the brakes?
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To have such extreme skidmarks in one's underwear or pants that he or she must have "slammed on brakes."
*Notices guy up ahead with skidmarks on his pants*
"Oh my God, dude, that guy must have really slammed on brakes!"