1. An occurence that can be defined as happening twice a night or every second night depending on the person you speak to.
2. Alternatively it can mean a person or group of people whose sexuality changes preference at night
1. Anthony: I jack it Bi-Nightly
Brodie: does that mean your going to jack it twice in one night?, you'll rip the skin off it.
Anthony: It can mean either
2. Mick: I'm going to get pounded tonight
Glenn: I thought you were straight?
Mick: Yes but i'm Bi-nightly
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