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.
When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).