When you pinch a loaf in the tank (upper deck) of a toilet, commonly as a prank, while getting a blowjob.
My girlfriend and I upper blumkin'ed the club bathroom to save time.
by heddynuggets April 26, 2007
Type your email address below to get our free Urban Word of the Day every morning!
Emails are sent from firstname.lastname@example.org. We'll never spam you.×