pal
chum
buddy
partner
Homie, Ace-Boon-Coon, , Right Hand
Some slang terms for arsonist are firebug, torch, and pyro.
Here are some slang terms for potatoes:SpudsTatersMurphyTots
fine
The slang terms I'm familiar with are: P.I. Private Eye, Peeper and Dick
Here are some examples:CarJalopyFlivverRide
bucksgreenbacks bills
Fabu. or Fab.
shela
Angel dust
Hoops, bangs
Some slang terms for suicide include "offing oneself," "taking one's life," "dropping out," and "doing oneself in."
An older term you may still hear is "pal" or "best buddy." In British slang, they have used "bestie." You may also see the term BFF (best friend forever). Sometimes, "homie" or "homeboy" is used in urban slang, referring to a friend who comes from your neighborhood. (In Yiddish slang, this is also used-- "Landsman" carries the meaning of someone you are familiar with, because they are from the old country or from your ethnic group.)