Suggestion for the "f*ck" bubble, if you're open to suggestions.
Maybe "f*ck around" might be a good alternative? It has connotations of messing around/goofing off, but can also be taken literally when coming from a person you wouldn't expect slang from. Then the response can be more of a "rephrase please" instead of a "don't shorten."
Idk if that works, but I can relate to having problems with localizing stuff like this, so I thought I'd give my two cents.