To roll a blunt completely wrong. To mess up.
Did he really just fluke that field goal?
Come on now, who fluked the wood?
An excuse to make you or a group of people feel better about loosing
Joe: that was such a Fluke Goal
John: init
Me: bs
Shit fluke is when you are sleeping walking and you take a shit in a place in your house other than the actual bathroom.
Abel did you know that last night you were sleep walking and did a shit fluke on the kitchen floor?