Same as a Pounce-and-Fuck, except with a more stealth and seductive connotation.
"That guy is Antonio Banderas-hot: he's a definite Bump-in-the-Night."
Someone that you ignore and find as irrelevant as hitting a squirrel in the middle of the night with your car.
Hitting the animal creates a bump that easily felt but subtle enough to where you think you've just ran over a pothole or some other object but you simply ignore as you want to carry on driving home from a long day.
Jimbo: Why are you even talking to me? I don't know you, you are nothing. You are just a Bump in the Night.
Bumping uglies in the night, much like a one night stand
person 1: Woah, I heard she got STD's from her last bump in the night.
person 2: Yeah I feel sorta bad for her, dumb bitch, she was smexy though.
To get fully kitted with battle rattles. To investigate and harm people that'll harm you. Or others
What was that sound? It's time go bump in the night