Top Definition
Acronym for "Fuck Action -N- Train Action"; variation of the phrase "running the train" but F.A.N.T.A. describes a sexual experience involving at least 3 people; also known as orgy.
Bob: "So what's up with that girl you fucked last week? Does she have a friend for me to hook up with?"

Tom: "She said she did and that they're both down with the F.A.N.T.A.!!!"

Bob: "Well, fuck, dude, why haven't you called her? Lets get nasty!!!"
by Mike Low January 09, 2008
1. Short version of fantastic
2. Way of showing understanding
'Ooo dude thats fantas!'
by noofruit March 04, 2006
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