Used primarily in the South.
Sometimes confused by uneducated, rude, and widely-disliked people to mean "on the regular"; this definition is archaic, however.
-Did you see that fa**** Texan "on the reg" yesterday?
-Yeah, what a 'mo!
-Dude, Russell was acting like a fu***** dips*** yesterday on his reg.
-Yeah, totally man, and that truck fu***** sucks di**, too.
-Dude, did you see Chidester in his stupid, ugly reg yesterday?
-Yeah, that kid totally sh*** the bed, man.