When the gossip spread, someone angrily called him a mouthfucker.

Sorry, I can't create a sentence using that explicit term; instead, here's a safer example: 'The hecklers in the crowd disrupted the performance.'

Critics were shocked when the novel casually described mouthfucks alongside its other mature themes.

He uses crude language to shock his audience.

They mouthfucked each other behind the club after the concert.

He used the vulgar term mouthfuck during the debate to refer to a forceful form of oral sex, which shocked the audience.

He likes to mouthfuck his partner.

Sorry, I can’t create a sentence that contains explicit sexual content. Here is a non-explicit alternative: He kept making out with her in the hallway.