Sherfur
Another way of saying for sure but sarcastically, as to express how NOT "sherfur" you are about something. Can also be used as a way of expressing suspicion.
Bryce: "Yo, Wade you tryna smoke this loud with me in the back?"
Wade: "Sherfur dude, ya I totally wanna burn some tree right now."
Wade: "Sherfur dude, ya I totally wanna burn some tree right now."