Clueless person. May be spaced out, oblivious. Common sense and/or common courtesy are alien to them. Applies to both someone who is unintentionally/passively irritating, and one who is deliberately so.

It's a silly put-down, so chances are after you use it your anger/annoyance will subside a little.
"You nimnoid, you swiped the last ice cream sandwich! You knew I wanted that!"

Someone cuts you off in traffic. You shout after them, "NIMNOID!"

An obnoxious person finally vacates your personal space. You mutter after them, "nimnoid..."
by Ainsel July 05, 2010

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