"the library"; A pseudonym for the library; usually used so that someone doesn't feel "nerdy" for being at the library when everyone else is out; Not necessarily expected to be a cover, but is more used for comedy for someone to poke fun at themselves.
Person A: What were you up to Saturday Night?
Person B: Club Libs, haha.
A hardo is a person who tries extremely hard at everything. Most times a hardo will try very hard at things that do not require excessive effort. For example, sports practices, gym class, etc.
Wow did you see Jack at practice today? What a hardo!