It's not an hour though. I don't where they got that from. Teatime is the time that tea (the meal, not the drink) is served, whenever that may be. When I was growing up, tea meant dinner and dinner meant lunch.
it is and it does work for sanitation worker, but would only be unsportsmanlike if you view profanity in any form as unsporting. the actual answer is literally about talking badly about the opposition so fits better.
We use British terms to mitigate the rude sound of cussing, and vocabulary to flummox muggles