You're a condom

Means you get used like a condom and tossed to the side like trash. Typically Its used as a roast or burn on someone.

Man 1: You know what man.
Man 2: What?
Man 1: You're a condom!
Man 2: What the hell does that even mean dude?
Man 1: It means you get used like a condom and tossed to the side like a piece of trash.
Man 2: I'm dead weak that's a hella good roast man.
Man 1: I know right who should I use it next lmao.