For what it’s worth, I only used the term ‘pottymouth’ to tweek Napscoordinator, one of Santorum’s more vocal supporters who in the past self righteously condemned the very talented singer Adele for having a ‘pottymouth’. Childish, but I couldn’t resist.
In my circles, we have a certain minister who was once informally known as the cussing Calvinist and regularly acts very “unministerial” in many ways that have nothing to do with his word choices. He's not doing anything that hasn't been done for a long time in revivalist circles, but it's not the way modern Calvinists, who have in the last century or so developed a reputation for being bookish and old-fashioned, typically act.
Fortunately that minister has toned down his language, but we need to distinguish between sinful language — lying, blasphemy and taking God's name in vain — and words which may be unwholesome gutter language, unwise, or unnecessarily offensive but not themselves sinful.