Fucking Genius. A title awarded to those whom are intelligent and wish to place emphasis on their natural aptitude in matters of the mind.
Kumar: Dunahee is a FG, did you hear how well he did on his test?

Felipe: Yes, and I heard he didn't even study. I wish I was a FG.
by Dresmeister April 10, 2010
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FG stands for fuckgirl. It's a shorter form and sucres way of saying it. A fuckgirl is a girl who acts like a fuckboy. She strings them along and uses other guys when shes already maybe dating someone else. She loves getting attention from many guys. Its the type of girl who thinks shes hot and the shit and attempts to show it without trying but it is obvious that she is. She's particularly easy and will go for any guy that gets thrown at her.
Ryan: bro, she's texting over 10 guys..
Zack: she's definetly a FG..
by Rushhour10 September 16, 2015
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Fangirl, usually a young girl obsessed with boybands.
Most notable in the fangirls of KPOP groups
A: Jessica is so obsessed with EXO and cute Korean stars
B: What an FG
by cheese374 April 17, 2014
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a faker ganger; not a real chollo or gangbanger. he pretends like he's a hardass when he isn't
FG- I'll feed him to my dogs I got from Satan's garage sale.

*shows dogs*

Man- Those are chihuahuas! You're just an FG!
by BOTDFbitchh November 22, 2010
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Abbreviation for "Family Guy", the animated American television sitcom.
"Yo bro, did you see the new episode of FG last night?"
"Yeah man, especially the part where Stewie tries to kill Lois."
"Bro, I think that's every episode."
by jroy5 January 20, 2009
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Fucking Gay: a title awarded to something or someone that is exceedingly gay.
Nahum: "Are you down for a walk in the park tonight."
Mike: "That is so FG."
by epmcj38 July 2, 2012
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To "feel good" usually from natural happiness due to the dopamine in your brain. At this moment of feel good nothing can make you unhappy. Sometimes also used as "feel great".

FFG-"feel fucking good"
Can't get any better than this.
"Dude, your girl is fucking another guy in the next room"
"No worries, I'm FG."
by Schack Attack June 17, 2008
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