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1.
The action of masturbation; essentially a replacement for "masturbating". Parallel to the meaning of "in bed", with the meaning of masturbation rather than having sex.

Pulled from the fact that most masturbation is done in a chair in front of a computer.
1: Man, I had a great time last night.
2: Were you in bed with someone?
1: Nope, I was just in chair, that's all.
by Sundae May 28, 2006
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