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Harry Potter themed Cockney rhyming slang for the word 'rapey'
He gets a bit Snapey after he's had a few
by Cranborne November 18, 2010
Snapey, derived from the name of an actual character going by the name of Severus Snape that exists only within the supposed alternate reality of Harry Potter. For someone to be snapey, they must be very goodlooking in a very obvious way, just like Professor Snape was greasy and in love with Lily Potter in an obnoxiously obvious way.

"I totally hate that guy for looking totally snapey today and throwing off my already lacking concentration"
by Akdovia September 09, 2007