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"
by ColonelTessieIceBeaconThe2nd January 10, 2013
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A verb describing some show, play, story series, etc. whose completion is interrupted prior to a completion of the story, generally causing public upset (as in the case of the Joss Whedon TV show "Firefly").
I'm so sad that the author died. Now his books have been fireflied.
by Anon E. Mouse IV January 23, 2014
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a mad sick new drug that makes you trip balls!
dude let's get glimmered on this firefly cuz it is sleek as shit!
by glittercon May 12, 2009
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Since the only definition of fireflies are about that stupid, overplayed song, I'm writing a real one.

Fireflies are little bugs that have chemicals to make their abdomens light up. They do this to attract mates, but it looks pretty damn cool also.

They are also for catching and putting in jars ^_^
Me and my friend went out and caught fireflies yesterday.
by Haxed13 December 11, 2009
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Distracting someone while you
1. Take something from them
2. Do something to them
"You know that girl that seemed interested in me last night? Turns out she took my wallet! That bitch was fireflying!"
by HaloNinca June 10, 2014
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Reach for the stars, over the fence, world series kind of gorgeous
Damn, that Dan is fireflies
by Kpopstargangster January 10, 2020
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