More clues as to where they came from: In a new epichoad after Beavis does his impression of a cop radio ("That's a ten-four, chaalklllkjkhdhkhakhjaa- kekjjhkhgotmegoodbuddy? CHHK!"):
BH: That's pretty good, Beavis. You should be, like, a cop or something.
BV: Yeah, m-heh, heh. I think it's, like, in my blood. I heard my dad was, like, in the Navy or something.