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1.
when a person can not think of a come back they say "fneh"

was created during a moment or boredom. meaning - fish never eat horse-radish (:
you are so lame and i hate you !
-... fneh !

do you know a really cool thing about fish ?

-err fneh !?
by Norrrisss October 03, 2009
 
2.
An exclamation of solidarity with one's fellow hobos, tramps, bums, and vagrants with connotations of the inevitability of the coming of the hobocracy. A statement of one's love for ones fellow Hobo sapiens. The exclamation is usually followed by a savage bludgeoning with a household object or a fatal or near-fatal stabbing with a spork.
"Fneh!" - Exclamation by a malodorous, disheveled individual after downing a triple shot of alcoholic liquor distilled from his own urine
by Hobocyclops April 25, 2011