A smackhead is a person who is severly dependent on heroin (smack)

Noun: a friend who is usually only called upon by a friend when a more primary/prominent friend is unavailable.

Taken from the term “second string” in an athletic competition situation. In football, if the star quarterback gets injured during a play, the second string is called off the bench to replace him/her. A “Second String Friend” is essentially benched until needed, if ever.

Synonyms: Plan B, Second Choice, Secondary Friend, Benched Until Needed

a heroin addict

A dirty anti soocial scruff that injects or smokes smack (heroin), normally seen walkin at a rapid pace, probably to get there fix. If seen approach with caution before you batter them.

A heroin addict, normally someone who shoots or smokes meth. Using the term smack, in the slang because normally heroin causes people to nod out, making someone come up and smack em on the head.

a respectable person whos poison of choice is heroin