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A case in which one starts masturbating, but then comes upon the realization that they are way too damn tired to continue masturbating to the point of orgasm; They typically weigh both sides of going to sleep or attempting to continue, and decide to fall asleep halfway through their session.

"I was really horny last night, but unfortunately I ended up masturbsleeping. The bright side, however: I was low on tissue!"
by wayofallflesh April 24, 2009
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