The ass of an fish.

Used as an insult.
1.
Random girl: Wow, she's such a fish anal.

Another random girl: Yeeah, I can't stand her.

2.
Random person: You're so stupid, Richard.

Richard: But at least I'm not a fish anal, you prick!
by Sir. Shita lot. May 24, 2011
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When a male and female (or male and male) have anal sex, the male puts a hook on his penis and 'fishes' in the anus for feces.
Jill and Sam enjoy anal fishing.
by the wild betchhhhhh July 26, 2014
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