Does it count if nobody else is there to hear?
I regularly use brand X expletives when a) driving, and b) at the exceedingly irritating ads on Classic FM before smartly switching them off.
I then often forget to switch on again for quite a while. Then it will so often be the news again, with the %*%*% B word - cue another resounding curse and switch off.
I find 'potty-mouth' an irritating expression, BTW, but then I'm all too easily irritated these days. OTOH 'Foul-mouthed' has a pleasingly no-nonsense ring to it.
Will Replacing School Uniforms With Tracksuits......


Dr. Google (q.v.) advises to keep off;

Problem with on-line jokes as always is that you (not the personal you) can't see the joker's smile or mischievious twinkle in the eye! 