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1.
Having eagerness or showing enthusiasm towards something.
"I am so gilly for a night out."
"Wow, Anna is really gilly for Alex tonight."
by annapea October 17, 2011
 
2.
An insult the equivalent of "idiot", "prat", "knobhead" etc. used in Gloucestershire, UK.
Sonny: I didn't mean to break it.
Josh: You're such a gilly!
by JJome February 08, 2011
 
3.
1) Sister Cabin of Binnacle
2) Your Mom in Labor
Oh, Gillies and Binnacle, they came from the same mom in labor
by supremecourtier March 09, 2005
 
4.
A person who sexually abuses disabled elderly men.
Grandpa's in the hospital, he got humped by a Gillies last week.
by LIgen October 11, 2012
 
5.
Marijuana (weed), a term evolved from the Harry Potter series for a magical plant: Gilly Weed.
Man I be jonesin' hard for some gilly!

or

Find out if anyone has any gilly we can pick up.
by Mack Millie April 30, 2010
 
6.
large black penis
man check that guys gilly
that gilly is huge
by carlen002 October 12, 2008
 
7.
Just straight up Fucked up.
That shit is gilly man.
by Leenuhj May 22, 2006