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besides an insect and a tv show, also a great song by breaking benjamin
Fuck you firefly, have you lost your light.
firefly by Adrian June 11, 2006
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
Firefly by Willie the Great June 11, 2006
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!!!!!!!
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:<
Firefly by TuEresMuyBlanco January 17, 2011
A female who hangs out at V.F.D social clubs gets drunk and flirts/sleeps with all the firemen
If your going to the V.F.D for wings watch your man around Mary, she's a real Firefly
Firefly by Pittsburgh slang king January 17, 2019
a firefly is when a man sets his pubes on fire, proceeds to have sex with a woman (lighting her pubes on fire as well) and finishing off by pulling out and using your jizz to extinguish the flames.
i gave this girl a firefly last night....the flames got a bit out of control...i no longer have eyebrows...
firefly by Grufes December 20, 2010