Derived from a cryptic petroglyph found in the Lucero Wash outside of Las Cruces, NM, blug has evolved into a broad term generally referring to a large, unkempt, rude, sweaty, mouth breathing, "ghetto" person, or perhaps vehicle belonging to said person. Subsequently, the word has been "acronymized" to mean Big Lazy Ugly Guy (or Girl).
"Did you see that blug walking into Wingstop?"
"That minivan with the neon undercarriage lights and the Raiders sticker is pretty blug."
Upon witnessing a 300 lb. woman climb out of a car in the Walmart parking lot, Michael points and exclaims, "Blug!"