Derived from the word anthrax. Really killer weed. Typically extremely frosty and gets you on the moon in a matter of a few puffs.
Ya man, Ijust picked up some new thrax from the plug and that shit had me geekin.
Absolutely high off your ass. When one is "on the moon" they are struggling to hold a fragment of a thought. Being on the moon is typically only achieved when one has really good gas or, what some would call Thrax
Man, Mikey brought over some moon rocks las night and I was on the moon, man