When someone is overly pissed off and decides to yell at everyone, even when they're trying to help.
Guy 1: What the hell do you want? You're not helping me!
Guy 2: Woah, dude. Don't be such a Pissy Pants.
Guy 3: Yeah. It looks like You Pissed Your Pants.

Pissed off Angry Pissy Pants/You Pissed your Pants
by SomeSeriousCarnage June 1, 2014
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