A gerdundermuffin is the act of climbing on top of a public toilet stall, doing the splits, and shitting into the toilet below. This is a feat, and when accomplished, the gerdundermuffiner should have a lot of pride.
Andy: Oh, God! Why is there shit splattered all over the toilet seat?!

Jacob: I'm sorry. I attempted a gerdundermuffin, but failed miserably.
by roshmacack August 08, 2012

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from daily@urbandictionary.com. We'll never spam you.

×