Two people are having sex. The third person is having oral sex performed on himself/herself by one of the people having sex.
Guy One: Yo, I totally took those two girls back home at the same time; it was awesome.
Guy two: You had a threesome?
Guy one: Not exactly. I only boned one of the chicks and ate the other one out at the same time. It was a Two and a Half-some.
Guy two: You are a legend!
by Dobs October 05, 2007
Sex involving a man, woman, and a midget of either sex.
Dude, I just had a two-and-a-half-some with Janice!
by Brett Y. Litsa August 17, 2010

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