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Unconsciously hyaving sex with your girlfriend when you're asleep. Named after a Scottish man named 'Tom' who once performed this, alas unreciprocated, act.
'Dude, I got told I Tomnambulised my woman last night. She was none too impressed!'

'Whoa! that's wicked tomnambulism!'
by Luke McB January 29, 2006
4 3

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