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1.
Someone who is like the character Severus Snape, from the Harry Potter series. Usually, it refers to someone being particularly sarcastic and distainful, and generally downright mean.
"Man, my chem teacher was all Snape-ish today."
"Did he tell the whole class you forgot your homework again?"
"Yeah, and he followed up with a sick burn, too!"
by LammySees June 19, 2008