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mystery fish is another word for a gross vagina. Its any girl that has been around and possibly contracted an std. You have no clue where she has been or who she has been with, therefore she could be called "mystery fish"
"Dude, Amber has been around so much, im changing her name in my phone to mystery fish"
by hcmhcxmc March 09, 2008
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Apr 26 Word of the Day
1. The default beliefs installed when you were a child.

2. An unexamined position you absorbed from your environment growing up.
I grew up in a conservative home so my factory settings lead me to vote Republican.
I grew up in a liberal home so my factory settings lead me to vote Democrat.
by riemannslost0 February 04, 2020
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