What is Have It Off?
1.
1. Verb, to have sex (in any form). Usually quick or very intense sexual encounters due to secrecy,
1. I wonder how many Real World contestants had it off when the cameras weren't rolling? I'd definitely have it off with Dan Renzi.
2.
Have sex.
"Let's go upstairs and have it off!"
3.
To make a large amount of money from some activity
"If you opened a new bar in the swanky part of town, you would have it off"
See