Definition of reddit:
(n) :
(Internet) An American social news aggregation, content rating, and discussion website.
(n) :
(slang, uncountable) Reddit's users considered collectively; Reddit's userbase, Redditors.
(v) :
(Internet slang, transitive) To mention (something} on the website Reddit.
(adj) :
(Internet slang, usually derogatory) Of, or resembling, Reddit's culture or userbase.
(n) :
(colloquial) A subreddit.
(n) :
(Internet slang, uncommon) A person's profile on Reddit.