to insert a plug into the ass while recieving fellatio, and then yanking it out during ejaculation, insuring perfect timing. also works with enemas.
by dickymon August 20, 2006

A girl and or miget that dresses up as a Oompa-Loompa and gives you a blumpkin. Or a real Oompa-Loompa that gives you one.
Adam's Girlfriend for halloween dressed up as a Oompa-Loompa and gave him a Oompa Blumpkin.
Part of the Oompa Blumpkin song
What do you get when a Oompa guzzles down your cum
While something long and brown comes out of your bum
Part of the Oompa Blumpkin song
What do you get when a Oompa guzzles down your cum
While something long and brown comes out of your bum
by Hollowzero April 11, 2008

Jake: Do you think Gilligan ever got a monkey blumpkin?
Justin: Yeah, i heard he got a few from Snubby.
Justin: Yeah, i heard he got a few from Snubby.
by PEACE GIBBLE January 1, 2010

by Fawn Delmajunc August 25, 2009

It is when You are constapated and trying to take a shit and getting head at the same time. and you get so much pleasure that she makes you shit everwhere and the water goes all over her face.
by M4r50cc1 November 20, 2009

The act being aroused and then masturbaiting while taking a lovely crap. Most people imagine a blow job while they are doing this act.
Landon would sit on the toilet for hours giving himself an imaginary blumpkin after his breakup with jackie.
by insanesexybeast February 19, 2011

A gay sex act performed in a public restroom lacking partitions between stalls, in which two seated participants take turns bending over sideways to perform fellatio on one another whilst simultaneously defecating in their respective receptacles. Generally not performed sequentially ("I'll do you until you blow out both your loads then you do me, ok?") but rather in rapid alternating bursts of a few seconds duration A-does-B then B-does-A. A professionally-executed blundonian blumpkin maneuver results in a virtually seamless and volcanic four-way explosion and is a true wonder to behold.
Conversation in public restroom:
Gay Guy #1: Are you thinking what I'm thinking?
Gay Guy #2: Blundonian blumpkin?
Gay Guy #1: Ha!
Gay Guy #1: Are you thinking what I'm thinking?
Gay Guy #2: Blundonian blumpkin?
Gay Guy #1: Ha!
by Chad Wooley March 4, 2006
