Wiktionary
n. The use of language considered offensive or taboo especially in movies and films.
Usage examples of "strong language".
Rhodan, disciplined to his fingertips, stern with himself, filled with the mission of bringing Earthly humanity to the rulership of the universe, had a man at his side who was his best friend and who also never flinched from duty-one who often recovered from the rough spots without embarrassment because he only represented himself for what he actually was, big-hearted, expansive, easygoing, boisterous and with an impulsive temperament that was not averse to using strong language.
The reasons were not given, but it is surmised that it has to do with a little strong language used on the world premiere of Associated's new color transmission.
White Fang picked out the post for himself, and Matt backed his judgment with strong language after the experiment had been tried.
He fumed and used some strong language, but I was still wearing the gun.