It's 69, but putting five fingers in the girl's ass. It was supposedly quoted by Arnold Schwarzenegger in his younger bodybuilder days, told by Smeez on an episode of the Heidi and Frank Show (heidiandfrank.com).
by badass833 September 28, 2011
The act of masturbating while defecating on the toilet. A combination of the words blumpkin and onanism.
My girlfriend thought giving me a blumpkin was gross so I had to resort to giving myself a blumponan.
by badass833 May 31, 2014