Autoblumpkin
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.
yo meehan, go give yourself an autoblumpkin in your moms bathroom.
Autoblumpkin
When you're taking a shit, and you give yourself a blowjob at the same time.
"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.