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1.
Someone who is extremely silly and loves to say silly ass alot.
"Hey Silly Ass!!"
by Spongebob Silly Pants March 03, 2010
 
2.
A crazy motherfucker who giggles a lot
the giggly boy is a sillyass

mom don't be such a sillyass
by That Dark Haired Chica December 31, 2003
 
3.
A person whose ass constantly looks like a clown. Or Nemo from Finding Nemo.
Bozo looks like my ass. Weird.......
by James F. Casey December 30, 2003