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1.
(v) To punch someone or something with extreme fury. Also can be used to describe a situation where one will suprise another with a punch in a sensitive area, thereby inflicting large amounts of pain. Can also be used with kick, as in to shit kick another.
I'm going to shit punch you in the dick!
That dude behind John just shit punched him in the face!
by slinkeril January 04, 2007
 
2.
The clentching of a fist, and thrusting it forwards into an opponents middle-to-left stomach area. The result is that the opponent will instantly drop all bowel contents.
"I'm Bruce Lee mother fucker. Hi..-ya....shitpunch"
by kimwah August 21, 2003