Top Definition
A person who in their essence contributes nothing to the situation or engagement at hand.

This term is often used as a moniker for someone who lacks personality, or interpersonal skills. As a result this "exister" chooses not to participate in conversation.

An "exister" has a negative connotation.

Also used in the present tense as "existing"

This person simply exists in all senses of the word.
"Stop existing on my couch you exister."
by D*ck n a Box July 15, 2011

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