A person known for being overly confident in order to brush aside the fact that his/her penis is small. In other words, he's compensating for something.
You know that douche Jack? Jenny screwed him the other day and found out he's just a Cocky McShortcock.
To expel raw sewage into ones pants due to surprise, shock or disgust.
Surprise: When I realized Clarence was a girl, I almost dumped my trunks.
Disgust: When that new Avril Lavigne song came out on the radio, I pretty much dumped my trunks.
"Oh crap. I'm going to dump your trunks."
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