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A slumbering man or woman who pleasures themself while in the presence of another slumbering individual. Unkowingly to the slumberbater they may or may not try to interact with said slumbering individual.
I didn’t know you where a full on Slumberbater
Oh I must have been slumberbating again... do you need a mankin.
by Lilmisscunt May 07, 2018
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