whats "ahahhaha just stfu and smd" stand for or even mean?

this guy i text always says this to me whenever i say how cool he is or if he wants to meet what does it mean?

(hes a really cool guy)

P.G. Wodehouse2011-12-04T04:48:33Z

Favorite Answer

STFU means he wants to stove top stuffing you. SMD stands for Sadomasochism while driving.

?2011-12-04T04:49:14Z

STFU means shut the f**k up.
SMD means suck my d**k.

He doesn't sound like the nicest of people!