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1.
big fat peepee. Ok time to analyze.
Big: Substantial in size
Fat: Plump, well filled out
PeePee: Male reproductive organ (baby making machine part 1)
Put'em together and you get a sizable well filled out male reproductive organ. Damn if you needed the urban dic for this I suggest you finish elementary school.

Also used as an insult many times adding "head" to the end.
Oh shit. I was at the stalls the other day and being the stupid gay fuck that I am I looked over at the guy next to me and I noticed that he had a big fat peepee! Man, girls would get pregnant just looking at that thing!

In an insult:
Hey what kind of big fat peepee head are you? Only a big fat peepee pushes other kids off the swings!
by Benji June 25, 2004

Words related to big fat peepee

stupid gay fuck
 
2.
From the Greek phrase "peepeeus biggus fattus."
Classic use; "Socrates you can just eat my peepeeus biggus fattus."

Modern use; "Hey you get away before I whip out my big fat peepee and slap you."
by Robert June 29, 2004