Anyone named Sebastian who happens to also be a bastard (literally or figuratively)
dude1"whats that asshole's name again?"
dude2"uhhh sebastian I think."
dude1"you mean sebastard"
by sebastian crucial December 12, 2006
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someone who is being mean, rude, bastard, etc
"god jen you are being a real sebastard, why did you eat all of my tootsie rolls?"
by jrap March 15, 2008
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