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A group of people who seat themselves at a table in a restaurant where a host or hostess is meant to seat you, thereby causing an inconvenience to the wait staff. Can also be "self-seater" singular for one person.
"Oh, there's some self-seaters on the patio, how annoying".

"Who sat those people there?" "Nobody, they are self-seaters "
by Peoplewholikejamillas June 03, 2017
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