Among these are obscenity, defamation, fighting words, express incitement to unlawful conduct, and threats.
One trucker did shout an obscenity, and a musclebound mechanic told them to go and do something useful like study.
Coined “obscenity regulations,” on face value they appear to ban material that “depicts or describes sexual misconduct.”
1580s, "obscene quality," from French obscénité, from Latin obscenitatem (nominative obscenitas) "inauspiciousness, filthiness," from obscenus "offensive" (see obscene). Meaning "a foul or loathsome act" is 1610s. Sense of "an obscene utterance or word" is attested by 1690. Related: Obscenities.
Behavior, appearance, or expression (such as films and books) that violate accepted standards of sexual morality. American courts have long tried to define obscenity but without much success. Some believe, for example, that any depiction of nudity is obscene; others would argue that nudity in itself is not obscene. (See four-letter words and pornography.)