Lightweight: (Adj), A term that can be used in many ways, indicating that someone/something either fails to do something, or someone/somthing doesn't reach your acceptance; When something is not heavy; When someone gets drunk very easily. (see examples)
Roger: Dude, did you hook up with that chick last night?
Chico: No bro, fuck her.
Petay: Shit bro i failed the math final!
Mark: Finish your beer you lightweight.
Clayton: Are you going to football camp?
Ray: Nahh that shits way to lightweight.
Ronnie : These dumbbells are super lightweight.
Jake: Amanda got drunk off that Henny way to easily.
Matt: Dude, she is so lightweight.