A blumpkin that is given to oneself, usually while taking a shit. When you suck and/or masturbate your dick; waiting for the climax to push the turd out. Gives an extra sense of stimulation.
by The Meehan October 17, 2009
"Last night I was taking a huge dump, right? So to ease the pain a little bit, I gave myself an autoblumpkin. Best shit ever.
by Officer Dickhead March 13, 2016