1. coucher - Noun
2. Coucher - Proper noun
One who couches paper.
A factor or agent resident in a country for traffic.
The book in which a corporation or other body registers its particular acts.
Source: Webster's dictionary; voulez-vous coucher avec moi (ce soir)? : "Do you want to sleep with me (tonight)?" or more appropriately, "Will you spend the night with me?" Source: Internet
In French, coucher is vulgar in this sense. Source: Internet