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1.
the shit; amazing; really good
your site is so gulley
by Tdotz gulliest March 10, 2005
 
2.
A play on the regular definition of gulley, which is a deep canal. Usually used when speaking of something that another who would seem "too good" wouldn't normally do.
"You want me to clean the backseat?"
"What is that too gulley for you? Nevermind man, I wouldn't want you to get your nails dirty."
by MissMissakaJ December 19, 2009
 
3.
Something that receives no competition or has an equality to other gulleyness

Dude did you just see that gash?

YESS! She is Gulley aswell!
by Gulleykid August 29, 2008