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When a girl is taking a dump while giving you oral sex.
oooo shit!!!!!!!!!!!!!!- a Shlumpkin
When a girl performs fellatio while dropping the kids off at the pool.
Stacy's boyfriend had to light a match after she gave him a shlumpkin
shlumpkin by JenThe80'sFan July 20, 2004
crumpkinblumpkin
To get your salad tossed while taking a piss
Oh man, Jerry's wife gives the best shlumpkins!
Shlumpkin by Noons June 13, 2008
Loud bass on your misic; when your beats is all the way up an the bass makes the rear veiw mirrors vibrate and shit falls down.
Nigga was playin [Chamillionaire, his beats was slumpin.
slumpin by Whodat May 13, 2005

Shumpkin 

Getting a blowjob while taking a dump in a hot shower
Bridget gave me a shumpkin last night. never will i be that happy again.
Shumpkin by bodacious caucasain December 24, 2010

Shumpkin 

As opposed to the classic blumpkin where you are receiving head while shitting, she is shitting while you receive a blowjob!
Schuyler: yo this girl just sucked my cock while she was shitting!
Oscar: YOU RECEIVED A SHUMPKIN!!!
Schuyler: YEA and I blew my load in her hair
Shumpkin by Moos3mon3y November 19, 2016