When a woman gives you oral sex and you are about to climax. Just before you ejaculate you give the woman a tap on the shoulder that tells her to stop so you can finish into a cup or the toilet bowl. Usually done if the woman does not enjoy the taste or swallowing ejaculate.
"My man is so nice. I was bobbing for apples and he gave me a courtesy tap before he jizzed in my face."
verb: an act of sex following a pricey (over $15) dinner, where the benifactor of the dinner reciprecates out of politness. Can be both passive and active.
After that ho bought my dinner, I had to giver her a little courtesy tap. I mean, that bitch was nasty, but Red Lobster sure is fine.
Any house/apartment/frat house/trailer/etc. which is used for individuals to crash (sleep, chill, hang out, lurk, etc.) for a period of time. In order to "crash", one must not actually live there (e.g. have their name on the lease, own said flophouse, etc.). Flophouses are typically used by college students, drug addicts, transients, vagrants, or other unsavory characters.
A flophouse may also be the home owned by the parents of a college student, who after being away at college, wishes to live as if he/she is still at college (e.g. staying out all night, returning just to crash at mom and dad's house, then leaving again), rather than conforming to the pre-college rules.
Example #1
Dude: (Talking to someone passed out face first on the floor of his college apartment) Hey man, who the hell are you? What do you think this is, a flophouse??
Bro: Sorry dude, I must have passed out for a minute.
Example #2
Mom: Where have you BEEN for the last three days? You come home just to sleep?? What do you think this is, a flophouse??!!
A person you hate intensely not because they deserve such hatred but because they serve as a focus for your general hatred. A healthy way to dispense with excess animosity.