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1.
the act of ejaculating on a person's inner thighs; which then results in the legs sticking together; this causes the ejaculatee to waddle like a penguin
"After John sloppy penguined Glenn's sister Dubbs, she waddled her way to the bathroom to clean up."
by J-Brizzle January 12, 2006
 
2.
Slapping a girls' vag while eating her out.

yeah.. don't do it.
ex: dude I totally gave my girl the sloppy penguin last night.. and she broke up with me today..
what I do wrong?
by DrunkCOnvOS December 09, 2008