An extremely corpulent person who rides next to you in a plane or bus such that their fat rolls have leaked out of their seat and are resting upon you.
Dudester A: Hey bro, how was your flight back from Chi-town?
Dudester B: Oh shit, this Stinky McChundermuddflaps was sitting next to me. There was fat EVERYWHERE!
Dudester B: Oh shit, this Stinky McChundermuddflaps was sitting next to me. There was fat EVERYWHERE!
by CtotheJ May 12, 2009
Get the Stinky McChundermuddflapsmug.