Top Definition
short for thank you as in thanks
person1: i dun it 4 u
person2: aww fnx
by sam!! xx August 16, 2006
Fucking X-Wife.

Best used as text short hand.
My fnx is such a crack whore!
by upgray_edd February 07, 2010
The best radio station in Boston. Period.
FNX really is the "true alterntative"
by AutisticPsycho December 05, 2004
To be terribly bad and usually in last place, much like WFNX in Boston, MA.
"Dude, you were FNX in that last race you ran. What... someone chop your ankles off?"
by Bart June 17, 2003
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