2
To initiate a fight by throwing the first punch.
"That guy was about to punch on!"

"Some bloke was flirting with my girlfriend - I was ready to punch on."
by iSkawt June 17, 2008
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4
Pittsburgh slang for saying that you'll whoop someones ass in a street fight.
YOOO lil bro from up the way said he could slay you in a fight.
GAT! Ill punch on that nigga in front of his raise then ill "Punch on" his dad too.
by ShadyJuJu305 April 14, 2017
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