to speak your mind with much anger or to speak with excessive amounts of rage.
I'm about to go left on whoever took my kool-aid.
You can see it in his eyes, he about to go left.
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The act of performing Grudge sex with the inclusion of anal sex.
The term was made famous during an episode of the radio show The Russ Martin Show.
Guy 1: My ex wanted to hook up so I grudge fucked her and put it in her butt.
Guy 2: Nothing like some good old grudge butt.