Hey (obviously), and the popular text slang such as lol, lmbo, omg
There will be plenty of slang terms for two times, however the common usage term is twice
Here's a good link that will probably help you a lot.
The meaning of YTB is slang on the internet for You're the Best. There are a number of other common slang terms such as LOL (laugh out loud) and TTYL (talk to you later).
Cowboys had a lot of slang terms for guns: artillery, hardware, iron, and jewelry were some of the most common ones.
Slang terms can vary by the area of a country where they're being used, though some are common throughout the US. One slang term for a great job is a cool gig.
A variety of slang terms exist for one's vehicle. The most common in use today for cars are "wheels" and "ride", though other terms like "float" and "rizzi" exist.Slang terms also exist for specific makes (such as the common "Caddy" shorthand for a Cadillac or "Jag" for Jaguar) or types (such as "beater" for a poor-quality car).
Money has many different slang terms attached to it. You can call money moolah, buck, bill, green, dough, cheese, cheddar, etc.. for American slang.
Plane, line and point. These are terms that are universally called the terms that cannot be defined.
It is usually just referred to as "anorexia" or, in slang-terms, "ana".
You need to learn the slang terms in order to use them.
The slang terms I'm familiar with are: P.I. Private Eye, Peeper and Dick
Restroom IS a slang term. Click on the related question