yes.m.s.
An affirmative response via SMS, usually a stock, one-word answer.
Alex: So, you poppin' round to mine after the game for a quick blast of GTA?
Pav: I'll Yes.m.s. you when I finish, bro.
Later...(Alex's mobile)
Pav: "Yep"
Pav: I'll Yes.m.s. you when I finish, bro.
Later...(Alex's mobile)
Pav: "Yep"