Acronym for "Prejudice On Basis Of Sexual Orientation."
Used when gay people, in a good natured manner, discriminate in favor of other gay people.
The flaming lesbian computer lab assistant was posobo when she forced the ditching straight girl to go back to class, but allowed two ditching lesbians to stay on the computers.
by Homophilics (H&I) September 30, 2005

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