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2.
frn
Federal Reserve Note, a paper printed as to resemble official money, as opposed to gold or silver coin or a United States Note, ostensibly backed by gold and/or silver.
How many FRNs does that cost?
by Peter314 January 17, 2004
 
1.
FRN
Fucking Railroad Nut; used by railroad employees to describe those who watch and/or photograph trains. Usage has recently fallen off with "foamer" being used in many parts of the country instead
We saw a ton of FRNs stopped by the side of the tracks when the steamer was coming.
by Schnauf March 07, 2006
 
3.
frn
Stands for "Face right now".
"Look at this picture of a cute cat. IS IT NOT CUTE?"
"frn -> :D"

"FML, we broke up. frn -> :C"
by Thisusernamewasalreadytaken August 21, 2011