When a guy receives a blowjob while the person giving has pop-rocks in their mouth
David: Dude Allison gave me a firefly last night and one of the pop-rocks got in my dick hole and hurts like hell now!

Ethan: That sucks, sounds like something from two kids one sandbox...
by Fireflylover69 November 26, 2009
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A bug that you imprison for your personal entertainment.
by Ratchet747473 July 10, 2017
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A DC universe villain who has made a crossover with discord.
Firefly: Hey fellas
Kame: Secks me daddy
Firefly: Shut your fucking mouth
by FireflyTheDiscordFirefly March 30, 2021
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Guy 1: “hey what’s the opposite of a waterfall?”
Guy 2: “what? why do you need to know?”
Guy 1: *sweating intensely* “it’s really important just give me the answer”
Guy 2: “um I guess it would be called a firefly
Guy 1: “thanks” *proceeds to run away into the darkness*
by actually tough what is cheese November 28, 2019
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Firefly Could you shine your light
Now I know your ways
'cause they're just like mine
Now I'm justified
As I fall in line
And it's hard to try
When you're open wide
by Willie the Great April 21, 2005
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TO masturbate ones girlfriend to the point of excretion of seminal fluids, whilst jumping out of an airplane, using a flashlight.
BRO I heard you gave her the firefly yesterday!!!!!!!
by mikehunt bendover nelson August 16, 2011
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The act of taking a lit cigarette bud and throwing it at a nearby pedestrian/friend. More often than not, if the victim is not a friend, they will get pissed.
Person 1: Hey, dude?? -Takes a hit from his cigarette-

Person 2: Yeah? -Turns to face him-

Person 1: FIREFLY. -Proceeds to throw burning cigarette bud at victim-

Person 2: AH. DICK. YOU HIT ME IN THE EYE. D:<
by TuEresMuyBlanco January 17, 2011
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