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1.
Zack Rosen, The Male reproductive organ of enormous size and strength
Wow! Look at big willy's big willy, he's quite the pole vaulter!
by Miggydal February 20, 2005
 
2.
someone of elevated status or respect
"He thinks he's a big willy now that he's in college."
by JGM April 22, 2007
 
3.
a large penis
Dude 1 : check out my big willy
Dude 2 : i feel shamed
by laminate April 08, 2010