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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!
by mindwarped March 07, 2011
 
2.
having intense sex while smashing and banging
last night me and my girlfriend totally shmanged
by devastetator October 13, 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.
by Nick Flanagan December 17, 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.
by drosaveahoe August 18, 2012
 
5.
a close male friend, cooler than most
whats goin on, shmang?
by phore-twunny April 21, 2006