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1.
A slang variant of the term "for sure", expressing an affirmation of the subject being disussed.
-"Dude, you aint pushin' no schwag, right?"

-"Fersher!"
by Rob F. July 26, 2005
 
2.
For sure, a response in agreement with another, but with a Canadian accent.
"We should totally go to that show, eh?"
"Fer sher."
by SelfDestructow May 01, 2013
 
3.
a hick trying to be gangster
-is your cock 12 iches???
-fer sher!!!;)
by glencoe wanna bes December 07, 2004