Euwww. You go so far as to hint that you want to have relations with their mother. That's disgusting. I can understand the red meat comment, but relations with their mother - I'd rather stick a radioactive pellet up my [***] and crazy glue it shut, then have relations with an old Indian woman (kamasutra or not).
You know what I mean. Anyway, I think they're scamming people who scare easily - I enjoy the repartee with them. These folks aren't very well versed in the language and they resort to repeating back to you, what you say to them.