Constant hard R profanity.
Cinemax content advisory for the uncensored reruns of this show: rated TV-MA-DLSV for violence (V), graphic language (GL) and adult content (AC). Sometimes, instead of adult content (AC), it'll be strong sexual content (SSC) and nudity (N) on the more sexually explicit episodes.
For early episodes, even then, the Cinemax content advisory, at the very least would be: rated TV-MA for adult language (AL) and adult content (AC) or at least (AC) alone. There is one graphic reference to a woman (can't say it) with a dog in a 1992 episode as "9 Broadcast Plaza."
For instance in one episode, he says the word "d--k" uncensored to reference his name but it's intended as crude humor. And yes the show has a lot of crude humor.
Cinemax content advisory for reruns, with initial February - June 1994 ratings reason bumper: contains violence, graphic language, adult situations, and adult humor. Sometimes it'll be nudity, and strong sexual content and graphic humor would replace adult situations and adult humor, if they were more graphic.