A fork of Rural Dictionary
Stick your hand in a girls pussy then shake it like a fish out of water
man i fishtailed that girl so much last night
Similar to a wedgie. The perpetrator sneaks up behind the victim and quickly inserts his fingers in between the victims ass cheeks, hitting the sensitive skin and putting tension on the victims cheeks and anus. If done correctly can be extremely painful, however should only be done in a joking manner among friends.
Mike: Damn I was walking in my living room yesterday, and Dana fucking fishtailed me so fucking hard.
Dave: Damn, that sucks dude. I hate Fishtailing
When girls who go to a uniform school roll their kilts wrong, the pleats at the back stick out.
Tawny: Man I was talking to Pete yesterday then I went to the bathroom and noticed I was fishtailing!
Olga: How embarrassing!
When you are having unprotected vaginal sex from behind and when you pull out and climax, you take a couple steps back, then run up behind the female and slap her on the ass with your jizz covered penis.
Dude, this chick was soooo pissed when I gave her the Iowan Fishtail!