tomnambulism
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!'
'Whoa! that's wicked tomnambulism!'