Much like with Raw, SmackDown has had fair share of language used, but it depended during the eras the WWE has had. Since SmackDown aired on terrestrial TV at the time of the 'Attitude'' and "Ruthless Aggression" eras, the Language was less frequent then on Raw and PPVs and stronger words were always bleeped out (SmackDown has always had a TV-PG rating).
Like super graphic "Bey," it depends. The uncensored versions are rife with hard R-rated language uncensored, some nudity, and possibly some very graphic violence (more than "Bey" of course). Not for kids. The edited versions (TV-14) are still not for kids.
WWE channel airings (as WWE has their own channel) and Cinemax of this UPN show, content warnings: rated TV-MA-DLSV for violence (V), graphic language (GL), and adult content (AC). Sometimes the more graphic episodes have graphic violence (GV) instead of just violence (V), and the more sexually explicit episodes have strong sexual content (SSC) and nudity (N). Not for kids (the uncensored version or even the edited TV version).