single fish

have a piss. West Belfast slang

I'm going for a single fish - I'm going to the toilet.
I need a single fish - I need to go to the toilet

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Single fish eye

As you're doing your female companion from behind and lick your thumb to jam it up her ass and she gives your the single eye look when she turns her head.

"Man jim, I was fucking Becky and she gave me the old single fish eye"