You Only Senior Once - an expression used by both seniors in high school and seniors in college as an excuse to do something stupid or crazy. It's similar to "YOLO", but is reserved solely for the use of seniors.

A jack off buddy (from 'cum' /'come', meaning 'semen', and 'companion'); a friend that you get together with for sessions of solo or mutual masturbation
Variant of: cumpanion (from 'companion' & 'cum'); jack off buddy & wank bud & JO buddy
Similar to: fuck buddy

Your Only Squirt Once

You Only Stick Once. The process of hitting on multiple people knowing that you will at least hook up with one of them. The genesis of this acronym comes from the expression, "Throw enough shit against the wall and something is bound to stick."

You Only Sting Once

A famous saying for bees who have the urge to sting someone

You only slide once. Termed for when you go on waterslides at waterparks and perform dangerous stunts and tricks on them. This usually occurs on rather large slides, with quite a bit of height.

The love child of "yo" and "so". Used to catch a peer's attention when one is about to say something important. Often capitalized when the shock factor of what the speaker is saying exceeds lowercase letters, becoming YOSO! When one is expressing concern or wary, they might draw the letters out to resemble "yooooossooooo". Derived from the popular comedy duo Jake and Amir. May also be used as a greeting between two friends.