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1.
a slang term meaning of course, most definitely or yes.
"fer shure maybe, fer shure not, fer shure ehh, fer shure bomb"
-fer shure, The medic droid
by iLiKEMUSIQQQQ January 21, 2009
 
2.
For sure.
But smashed together.
Said when agreeing with someone.

People on the west coast usually say this more better version of 'for sure', just cus it sounds cooler and more skater-like i guess.
Shakyra: Omg Kali, did he like your hair?

Kali: Fershure, he said it looked like Taylor Swifts.
by killakyraskeetskeet July 26, 2010