1) A small insect that has a glowing butt
2) A short lived science-fiction show that the antichrist FOX cut after only 11 episodes were aired. Had the pilot been showed at the beginning, it would have gained a huge fan base for it's character-development. Unfortunately, the dicks at FOX didn't show the pilot first, so... here we are.
3) A ship that is popular to smugglers for it's many nooks and crannys. It's design is that of a bird and a firefly
1) "Mommy... I think I killed the firefly!"
2) "Mommy... I think I killed the firefly!"
"That's ok, little timmy. FOX did the same!"
3) Mid-bulk Transport. Standard Radion Accelerator core. Class code 03-K64... Firefly.
by Sobo2Bonzai October 02, 2008

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a psychoactive drug, most commonly found in tablet form (much like LSD, that induces both auditory and visual hallucinations
That firefly made me see unicorns in the sky.
by baka burger May 12, 2009

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A novella written by Lacey Reah about bisexual sex vampires
That book "Fireflies" was off the hook!
by Cynthia Ipukinkai February 13, 2011

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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 10, 2009

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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"
by ColonelTessieIceBeaconThe2nd January 10, 2013

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Little tiny insects that tend to die when they make love with cigarette ends.
Hey dude! That firefly is dirtying your cigarette end!!
via giphy
by The agar \_/ BACFORD July 05, 2016

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