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To be a guest to a party, group outing, etc, and invite/bring along others, who were not included in the original invitation. Note: If an invitation includes permission to bring along one or more unspecified people (e.g., "and Guest" or "+1"), then it does not count as a subinvite, as long as the guest does not bring along more people than specified on the invitation.
"I thought this was supposed to be a Girls' Night Out."

"It was--until Lisa subinvited her boyfriend."
by nerd25368 February 14, 2015
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