When an individual, usually a guy, will
get soooo into a
masturbation session that they'll
get completely naked, touch their bunghole, and even rub their own nipples. They might even have sex with a couple of pillows or cushions to simulate a real sex experience.
"Dude, I'm going to go and
jack-off. Wait, I think I'm due for a
sexy-time
jack-off. I'm excited!"