Pretty much the same as normal WatchMojo videos. Words are normally said in footage, and sometimes by the hosts.
As this is a UK-specific version of the channel, there are infrequent uses of British swears and slang terms (e.g. "Cunt", "Arse", "Twat", "Wanker", "Bollocks", "Slag", "Bastard"). As above, they are mainly heard in dialogue and rarely by the hosts.
Anything stronger than "Shit" is muted most of the time, and the hosts state they don't say the words out loud in the videos (due to YouTube monetization guidelines)