What is Coucher?
1.
When a man gets in a fight with his wife/girlfriend, and has to sleep on the couch that night instead of in bed, it's considered a coucher.
Bitch: You don't do anything around here, you're a lazy sack of shit!
Man: I don't work 40 hours a week to listen to you bitch. Why don't YOU get a job?
Bitch: Fuck off.
Man: I guess tonight's a coucher...
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2.
It's the guy or chick that gets so bombed after a party he or she sleeps on your couch and when you wake up, that person's still there even though you didnt ask them to stay.
Last party I went to, they had a coucher and when I woek up, he stole some soda.
3.
A lazy, work eligible, teenager who refuses to work. But instead, lies around on the couch all day.
Jeff is such a coucher; why doesn't he just get a job?
or
Sallie used to earn money but now she's a coucher.
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4.
A person who masterbates on the couch while their room mate is home.
When Kyle walked out of his room to get a snack, he found out his roomie Ben was a Coucher.
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5.
A woman with a nice body, specifically a nice posterior, but an ugly face. The term "coucher" is derived from the idea that one would want to fuck a woman like that while she was bent over a couch, so as to avoid looking at her bad parts.
See also
"I saw that girl from across the room and she looked pretty hot, but when I got closer I realized she was a total coucher."