When someone is being a der case (see definition of der case)

It is like the verb of the phrase der case.
David: "Oops! Sorry I spilled my glass of orange juice on your brand new white cardigan from Hollister!"
Jennifer: "Stop dercasing! Ughh little brothers are soooo annoying. But you're still my favorite person!"
by YS. are. cool. July 3, 2009
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