Definition of normie:
(n) :
(slang, usually derogatory) A normal person; one with commonly held, normative beliefs, neurology, tastes or interests.
(n) :
(Internet slang, usually derogatory) A person who is not a member of an ingroup, such as a fandom or other (online) community; an outsider.
(adj) :
(slang, usually derogatory) Like a normal person; mainstream, belonging to an outgroup.
(n) :
(slang, Alcoholics Anonymous) A nonalcoholic.
(n) :
A diminutive of the male given name Norman.