Benzos, Dippers/Blues/Footballs/Bars/Double G's (Xanax), Pins/k cut outs(Klonopin), Out-of-hands (Adavan), The phase "take a chill pill" originated when V's(Valium) first came out. I'm sure there are many different terms depending on your location.
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
There aren't slang terms for people's names.
One will find that there is no slang term for brake lines, as they are not referred to in another way. There are many other slang terms for street etiquette, but there is not a slang therm for 'brake line' currently.
does a Finn in slang money terms mean "five"?
To fight. As in, get ready to rumble.
Here are some slang terms for potatoes:SpudsTatersMurphyTots
"Victuals" IS slang -- it means food. Other slang terms for food include grub, chow, and eats.
There are no terms used only by gay people and not straight people. But if you're talking about gay slang, Here is a list of Gay Slang Terms.
firebug
Cool.