Irish slang, From the Gaelic 'Giolla' meaning servant, used to reject an order from a person
Get me that will ya?

Ask me bollix, i'm not your gilly
by banjaxed January 2, 2011
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dublin ireland term for A, condition or period of bad luck that appears to have been caused by a person by mentioning a specific thing.
1. what a lovely sunny day not a rain cloud in sight, don't say that you'll put the gillie on us.

2. c'mon ireland we are going to win the world cup, why would you say tha now you after putting the gillie on us
by jay86 July 3, 2012
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Wack and gets no bitches and most likely ugly
You acting like a gillie right now nigga
by Swagnigga420 March 21, 2017
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That queasy, watery feeling somewhere around your upper neck/under the back of your tongue/within your jaw glands (i.e your gills) that always occurs just before you are about to vomit.
Oh bollocks, I feel all gilly again - you've got about 3 seconds to get me a bowl.
by Sidney from Sydney October 21, 2017
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sam(aka freetard) is a gillis. also called SG(super gillis)
sam: whats a gillis?
jared: your a gillis
me: ZING!
by noha March 27, 2007
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The Gillis Principle outlines the proportionality between the amounts of mountain dew and marijuana that would kill an average human.

Mathematically, 1 Gillis (Gi) is the unit of either substance (Marijuana or Mountain Dew) that would kill a human when consumed within an hour. Both substances have calculated conversion rates based on experimental data.

Mountain Dew: 8823mg Caffeine = ~173 cans = 61L = 1Gi/Hour
Marijuana: 68000g THC = 971 000 Joints = 1Gi/Hour

It can be concluded using the Gillis Principle that Mountain Dew has a far higher lethality rate than Marijuana.
Friend 1: "Hey, did you hear? Jared smoked himself to death last night."
Friend 2: "Yeah that must've been a Gillis-ton of weed!"
Friend 1: "Using the Gillis Principle, that was like 971 000 Joints."
by PolChan December 6, 2014
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