The act of taking a shit in the top part of the toilet while a girl is giving you head at the same time.
Last night my girlfriend was so drunk and she was pissing me off and she surprisingly let me pull off an Upper Blumpkin
by dupajuda October 15, 2009
Sitting on a toilet AC Slater style while defecating, and performing fellatio on an individual in the act of upper decking the same toilet.
It sounded like a good idea last night, but we spent all morning cleaning the tank after trying out the upper blumpkin.
by szkud September 28, 2013