To be content. To be at one with yourself. A positive connotation or reflection about yourself or something else. The word derives from a mixture of the 2 terms "straight" and "gravy", with an addition of the term "wavy". (Straight + Gravy, with the Wavy infused). A term coined by Pittsburgh based rapper Beedie.
John: Would you like something to drink?
Jim: Nah, I'm straivy. Good looks.
Matt: How's the fam, bruh?
Mike: We straivy mane. How you?
Bill: Should I grab another Sprite?
Bob: No thanks, this should be straivy.