have it off/away with somebody
have it away (with someone)
To engage in sexual intercourse (with someone). Primarily heard in UK. I wouldn't have it away with someone you work with—it will only make things really complicated at the office. I can hear my neighbors having it away at night—it's really embarrassing!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
have it ˈoff/aˈway with somebody(British English, slang) have sex with somebody
Farlex Partner Idioms Dictionary © Farlex 2017