The full form of BYOB is bring your own bottle
“BYOB” stands for “bring your own bottle.”

It is a phrase that has been around before the internet. The bottle here isn’t a bottle of water. In “BYOB,” the bottle refers to alcohol.

Similar internet slang terms

There aren’t many similar words, but the term “BYO” means “bring your own.” This can be used with anything that someone would like others to bring to an event or gathering.

Aside from “bring your own bottle,” “BYOB” can also mean “bring your own beer” or “bring your own booze.” Some even say it could mean “bring your own beverage.” In any case, it almost always means that people should bring their own alcohol.

Example 1:
Friend 1: Have you talked to Craig about the party?
Friend 2: I didn’t, but my friend Zoe did. She said he’s a dope bartender. I’m looking forward to it!
Friend 1: That might be so, but I don’t think he’s going to have the usual spread.
Friend 2: What? What do you mean?
Friend 1: Rachel said it’s gonna be a BYOB party. If you want some of those fancy cocktails, looks like you’re gonna have to bring the bar with you!
Friend 2: Eh, I’ll just bring some beer for me I guess.