horizontal mambo
slang The act of sex, especially sexual intercourse. My brother spends his weekends cruising the bars around town in hopes of doing the horizontal mambo with someone.
mattress mambo
slang An act or instance of sexual intercourse. After flirting at the bar for a while, we went back to my place for a little bit of mattress mambo. My roommate's girlfriend is in town for the weekend, and I've had to listen to them doing the mattress mambo every since she got here.