A combination of words stand and up. Usually used to describe someone that constantly stands people up.
We all had plans to go skiing Saturday, but Madeline stuppered the whole event, instead deciding to do homework all day.
by MedusaFish March 11, 2011
1. verb (past stupped)

- to "stand up" as in forfeiting a prior arrangement that you were obligated to attend

2. noun

-A person that frequently stands people up.
Man, I really don't like how that girl is a real stupper!
by cronkaliscious March 11, 2011

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