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When one guy seemingly at random punches another guy in the chest, knocking the air out of him. This is done back and forth between the two males as a game. Each incident is increasingly surprising for the victim.
Guy 1: -sitting on the couch, watching T.V.-
Guy 2: -creeps up behind couch, with stealth-
Guy 1: -goes to change the channel...-
Guy 2: -attacks- "CHEST!"
Guy 1: -falls over, without air-

This is chesting.
by anonymous576 January 28, 2006
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The act of thrusting a penis of a homosexual male between his overweight partner's moobs (man breasts). Possible with transexuals and also dildos. Could be considered a sexual fetish to some.
"That was real fun chesting last night my gay lover."

"Man, my chest hurts"
"I told you we should've used some lube!"
by HHSmysterio December 08, 2010
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