Is a way to get stuck up more hours at work. It's also a greatway for your boss to keep you sucking their asses, whether they want to or not, they activate or deactivate your on calls.
I got an on call activatedtoday, so I couldn't go to the beach! Damn fuckers!
When one is required to perform whatever the other person asks no matter when or where they are at the time on call is said. Usually used to receive head or anything that the person wants.
Dan called “on call” while he and his lady were having dinner at a upscale restaurant and she was required to immediately get on her knees and perform oral sex. The individual who is being told “on call” has only 1 minute to start whatever task that they are being told to do.
Usually present in long-distance friends that choose not to have a long-distance relationship or friends that lead very busy lives and don't want the hassles of a full-fledged relationship.
An extension of a fuck friend
When visiting the West Coast, I'll get together with my on-call girlfriend for dinner & a movie and usually a night of great sex.