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your guest when you are invited to an event
"billy's gonna be my plus-one at jane's party"
by c-line April 25, 2004
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Apr 2 Word of the Day
Music so good it could elicit sexual arousal.
The new We Came As Romans albums is chock full of bonerjams.
by lpvitus October 28, 2009
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2
Accompanied by a guest.
"Can you put me on the list for the 'Matrix' screening? I'll be plus one."
by Matthew Michaud January 19, 2004
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3
When a girl/guy keeps you as a side peice because your not good enough to be her/his official relationship.
Dont worry your my plus one.
Side peice
by Poop poop 69 June 23, 2019
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4
At public parties and nightclubs, the guest of a person who is on the guest list, and who normally pays a discounted entry fee. Also, the state of having such a person.
"You are on g list plus one. Do not mention this to anyone."

"You can be my plus one."
by Wrench December 16, 2007
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5
Usually written '+1', used in a forum post to indicate that the post serves no purpose other than to increase the poster's postcount. Usually used after an empty post along the lines of 'I agree'. Often used in a sarcastic manner to indicate the pointlessness of the entire thread.
by Emperor Spleen February 04, 2004
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6
(noun) - the person who is invited to join an existing coupled unit in sexual activity resulting in a three way or menage a trois. Depending on the genders and desires of the couple, the "plus one" may even become a lucky pierre.
"'allo, are you two a couple? Fancy a plus one?"
"Nice accent. Where are you from?"
"Australia. And I'm only 16!"
"See ya'!"
"But I'd make a great Lucky Pierre!"
by whirled-traveler January 15, 2009
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