My parents are the same way. I've heard my dad say 💩 once, when he was angrily defending for the thousandth time why he didn't like pizza ("It smells like somebody 💩 in the oven, that's why!").
The funny thing is, where he worked, it was a very coarse environment, and I always wondered if maybe he had a split personality that way, filthy-mouthed at work, squeaky-clean at home.
Since his mind has started to go, I've heard him mutter "dammit," and "assh*le," under his breath a couple of times. Not long ago, he told a fairly tame, but definitely risqué joke, out of nowhere, which was pretty funny. He probably overheard it on the TV.
My mom, she only ever says 💩 when she's startled, like if she burns her hand on the stove or drops a plate, and it's not out of anger, but out of fear/surprise. She once famously threw a sawmill customer off the property for saying "frickin'," and when he apologized and tried to explain that he didn't say the bad f-word, she shot back, "Yeah, well, we all know what word you meant, and I won't have it!"
Let's see how Mrs. Doyle feels about it all. Depending on where you work, this may or may not be appropriate for the office:
View: https://youtu.be/XLTnacYvvg4