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1.
verb: (1)the act of sitting on the toilet and excreting fecal matter whilst leaning into a near-by garbage can and/or sink and vomiting. Usually transpires after heavy drinking combines with copious amounts of food.
(2)the act of sitting on the toilet and excreting fecal matter, whenst you realize you must vomit, and you stand up, and turn around and puke all over your shit.
(1)My friend Clyde had a big dinner for his 21st birthday, then we went out and got him hammered drunk. When we returned to his domicile, he proceeded to head into the bathroom, drop his trousers, sit on the toilet, and Shit Puke for the next 2 hours. "Let it Ride."

(2)I was sitting with this chick in the living room of my friends house in college when I had to take a shit. I went into the basement (where there are no walls, just a toilet) and proceeded to shit-puke after too much Taco-Bell.
by Pooke May 21, 2009
 
2.
When because of out partying till the early sunrise you decide to releave yourself by leaning out your friends window and puking on the street, but instead puke out your ass.
"I never Shit-puke before, but once i puked-shit"
by Haryazz December 12, 2003
 
3.
noun. nad.
nad == shitpuke
by #malden July 15, 2003