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1.
When a girls legs are open and a smll of fish suddenly creeps up on you, usually originating from the vaginal area.
'OH, FISH. Kadi, shut your legs.'

'You have a fishy fanny'
by Jimmy Pee October 17, 2006
 
2.
A fish like smell eminating from a woman's vagina...usually due to using the wrong soap, commonly thought by men to be a unwashed fanny but what do they know!!
Nice lips but her waf stunk a bit fishy!
by Tracey August 29, 2003