Salvia, in America is a legal hallucinogenic drug, the term "Straight-salvia" spelled as a conjunction "Straightsalvia" or in txt lingo "str8salvia" (verb) refers to someone who is slick, able to break the law without getting caught, sneaky, crafty.

literally "extending ones appendage in a manner that's reminiscent of the infamous salvia plant"

Straight-salvia (adjective) : crazy, on the edge, "out of base", on the brink of illegal activity