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1.
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 25, 2014
 
2.
Fishing or searching with reference to the anus.
That gay guy was really into anal fishing.
by gratenate July 25, 2008