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When someone flicks a cigarette out their window and said cigarette flies back into their window or the window of a surrounding car. Douche points are awarded for hitting the driver of the other car.
ex1: WTF, I just got hit by that douche's firefly.
Firefly by OnikunZ April 17, 2009
Someone with not only a low Intelligence Quotient, but a propensity to only think out of their tail end.
Bush is a step below a "Low wattage bulb", because he only thinks out of his... (what a "Firefly").
1. a tv series.
2. an insect.
3. the coolest and sexiest man alive. bow down, bitch!
firefly by firefly June 11, 2006
Firefly- A boyfriend or a best friend that is willing to be adventurous with you.
Alexis and her firefly are always together.
Firefly by Cute_Girrll_97 September 17, 2015
A girl who goes to raves, wears slutty clothing, and will blow anyone who gives her drugs.
Man, that girl is such a firefly. She was practically begging me for acid.
firefly by Caen A.H. January 31, 2017
People from AZ who travel to cooler states during the summer months. They arrive after Easter, go home after Labor Day.
Kid: "Dad why did that old man from AZ just pull out in front of us and drive slow?"

Dad: "Son, its summertime in Arizona, that is a Firefly"
Firefly by KarenLinAZ May 9, 2017