S03E01 - Payback. Termite, while coked out of his gourd, shrinks down and crawls into a dude's urethra and starts making his way toward his prostate. While he is in there, he sneezes, returning him to his regular size, with, erm, predictable results for this show.

So not quite exactly "living in his ass" and "controlling him with levers and wires," but not for lack of trying.