Mustard Fish 

Stinky vagina typically resulting from an STD or yeast infection.

Mike went down on Sarah and his upper lip smelled like mustard fish fir two weeks.

Mustard Fish by Alpha1Romeo2 June 8, 2016

Mustard Fish 

Definition 1: A fish that is covered in mustard, or just has mustard on it.
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Definition 2: A fish that is the color Yellow.
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Both are equally unfunny, however, are only rage-inducing to those who have had enough of definitions similar to this one done by you, alá my ex-friends when i introduced Hungry Frog to them-

Definition 1:
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Person 1 sees Person 2 cooking, specifically fish fillet with mustard within the sauce on it.
Person 1: “yooooo mustard fish!!1!”
Person 2 then gets very angry, and commits a Bravado Moment.

Definition 2:
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Person 9 and 7 are fishing together, Person 7 catches a fish which seemingly is the color Yellow.
Person 9: “yooooo mustard fish!!1!”
Person 7 then eats Person 9 in a fit of rage.

Mustard Fish by DillonVentures August 22, 2021

mustardish 

A) a condiment, that's, as the name implies, a combination of mustard and relish
B) a color that's a mixture of mustard yellow and relish green
C) adj: something that's dark, murky, and possibly yucky, combined

Ron,, from the Harry Potter series,: yuck, my mom sent me a mustardish sweater.

Harry: it's actually maroon, you can't properly see the colour, due to the lack of light.

mustardish by Uncle Dimma July 20, 2013