The act of fellatio on a male while the female is on the toilet urinating
Yo bro that chick blew me while she was pissing then i had to shit so she gave me a blumpkin
by Facefukerson August 24, 2017
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Taking a shit while doing a handstand, while getting a blowjob.

It is essential that the shit spreads down the body like a waterfall.
Babe what do you think, is it time to perform an upside-down lumpkin?
by grantjohnson June 2, 2010
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