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1.
Shmang is the combination of two slang words for sex. "Smash" and "bang"
Joe : Did you have sex with that fat chick last night?
Bob : Not only did I have sex with her, I shmanged the sh*t out of her!
de mindwarped 7 mars 2011
 
2.
having intense sex while smashing and banging
last night me and my girlfriend totally shmanged
de devastetator 13 octobre 2011
 
3.
an undefined amount of grime that appears on clothes, skin etc especially after eating crisps or saucy foods.
Everytime I leave the cinema my hands are always covered in shmang.
de Nick Flanagan 17 décembre 2007
 
4.
To have such amazing sex with some one that you are smashing and banging them at the same time.
"That lady is so fine, i just want to shmang her till the sun rises, then sets."

"Oh my god, he shmanged me so good last night."

"So i was shmanging this girl behind the club and she was so drunk that she doo-dooed all over herself, i think i did a damn good job.
de drosaveahoe 18 août 2012
 
5.
a close male friend, cooler than most
whats goin on, shmang?
de phore-twunny 21 avril 2006