There is some scatological humour; the intro for "Sequel Month" features Nostalgia Critic's head spinning around in a toilet bowl while fart noises play, and the review for "Playing With Fire" features a repeated scene of a child defecating into a man's gas mask. The "Bridge to Terabithia" review features fart noises and people on the toilet.
More recent episodes have contained less profanity (occasional use of shit, son of a bitch and asshole), and less frequent use of the f word, as opposed to previous seasons.
Strong, but needs some getting used to.
The curse words that the critic uses the most are, Shit, Fuck, Ass, Damn, Dick, Pussy, Hell etc.
The critic is very creative with his cursing; for example, an annoying internet troll is named Douchey McNitpick (who appears in the Fuckups episodes no less) A one time character (who appears only in his Sonic review) is named Fuckup McDumbass. He also describes Ninja Turtles 3 as "horribafuckus"
He also comments on language being too harsh for PG-rated movies (Warriors of Virtue, Richie Rich). Also in his Doug's First Movie review, he asks why "funkytown" sounds like "fuckytown".
He makes a guy call his sister a twat in one episode. "The WORST Christmas Special Ever".
While reviewing Les Misérables, the critic exclaims Jesus's name in vain
In "A Christmas Story 2" Mike Jeavons almost says "c*nt" but is cut off mid-word