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The act of putting one or more glow sticks in your butt or pussy, usually as part of a sexual fetish, usually in the dark. Most likely to be used while dogging, at sex clubs and for public sex to attract voyeurs and additional participants.

Occasionally used as part of a drinking game, or drunken challenge.

Also known as a glowworm or beacon.
example 1 : "When I walk the dog in the wood at night, you sometimes come across people dogging, last night I spotted some fireflys - there were about 10 others watching them, I got really horny."

example 2 : "Last night at the sex club there were 3 female fireflys - using glow sticks as dildos!"

example 3 : "We were playing drinking games last night, and did a firefly race. Jeff, the fat bastard was so slow, the cops turned up and nearly caught him - imagine having to explain being naked with a glow stick jammed up your shitter to the fuzz"
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Short for a 5 Hour Energy. You are so jacked up that you get the words out and it sounds like firegy.
I'm sick of Mountain Dews, I need a firegy to stay up all night tonight...and I don't want to have that 2:30 feeling today.
Firegy by Big Aud August 10, 2010
Related Words
Verb: To end something (usually a tv show) too soon.
I hope xyz tv show comes back and they don't firefly me.

Think also to be Fireflied.
Firefly by IrreverentGal October 8, 2014
Firefly is by far the most Goram best set in space t-v series of all time. Bar none!!
"Hey Jimmy, this is so Goram good" "Oi Noonga, it surely is, it's so good it's firefly"
(Queer terminology, noun) A term used to describe someone who comes out as Queer while in a hetero-facing long-term partnership/marriage. Symbolic of spending a lot of life “underground”, going through a metamorphosis, and then emerging as the truest and most authentic self that glows in the dark and brings joy to others. Alternative to “late blooming lesbian”/“late bloomer”/“late in life lesbian,” but intended to be more inclusive of gender identities/expressions and sexuality representations.
“...Oh yeah, she’s a firefly, she left her marriage a few years ago and came out. Now she’s living her big queer life and is happier than ever!”
"Have you seen how many Fireflies there are on TikTok?! It's like the pandemic hit and they all found each other on that app!"
Firefly by MH2021 February 11, 2022

Firefly Stick 

When you go camping and step on a firefly and scrape it off of your shoe with a stick and repeatedly shove the stick in your brothers bootyhole repeatedly…over.and.over.AGAIN
I was really drunk after the party and went hiking,and unfortunately I accidentally gave my brother a Firefly Stick.
Firefly Stick by Everything Suks October 8, 2022

mississippi firefly 

The act of flipping a lit cigarette butt at someone's face to instigate a brawl.
Bobby Ray's daddy asked the little league umpire if he had ever seen a Mississippi Firefly ? Before he could answer Bobby Sr. had flipped a cigarette at the old timer and assaulted him.