Anything that seems a little off or out of place, or a person not quite right in the head.
That cole slaw seems a little fishtaygle as if it was made 2 weeks ago.
Steer clear of Cleatus, he's been acting real fishtaygle since he ran out of meth.
(verb) to bend a girl over a fish tank whilst delivering anal sex to her. Mid-motion remove the lid of the tank and repeatdley dip the girl's head in and out of the tank all the while still ramming the girl in the anus.
I got this girl round last night and fishtanked the shit out of her!!