Having heterosexual relations.
A: Hey, man, what'd you and Cindy do last night?
B: Went out to dinner, then back to her place for a few hours of fish-gutting.
A: Sweet!
Another word to describe bad dogs breath. Smells like fish guts, and liver.
Ko-Ko had bad case of fish guts.
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When you don't clean your belly button so it starts smelling like fish.
Ew I think I have fish-gut my belly button smells like fish.
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