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Homecoming king who gets concussed and doesn't come to school for 4 weeks (perhaps more), older women love him
Is that 18 year old dating a 42 year old woman?
Yeah, he's such a Gillis.
Gillis by mnhockeyfan October 16, 2019
sam(aka freetard) is a gillis. also called SG(super gillis)
sam: whats a gillis?
jared: your a gillis
me: ZING!
gillis by noha December 15, 2008
Gillis is a good man.
He's a wonderful husband and father and will spend the rest of his life loving his sweet baby chell ❤
Gillis 💘 chell
To infinity and beyond
Forever and always
Gillis by Twistedbud May 7, 2023

Gillis goggles 

Phenomenon in which one's consumption of alcohol makes physically unattractive persons appear beautiful. Gillis goggles is a more intense and severe version of the classic "beer goggle" phase. While "wearing" gillis goggles, literally anyone/anything is fair game.
Ross: "Dude what the FUCK were you thinking last night when you were dancing with that fat chick??"

Matt: "fuck you, she was pretty hot"

Ross: "no dude you just had a bad case of the gillis goggles again."

Gillis-Graduation-Gobbler 

A name for a woman that got too hands at a graduation party.
Dude hide, it's the Gillis-Graduation-Gobbler

Oh no! I'm next!

the gillis principle

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."
the gillis principle by PolChan December 6, 2014