It's also a common saying popular on the internet by trolls who are about to rape you or just want to depress you because you don't have a life and sit at the computer all day.
Your chances of epic win are 50% and your chance of epic fail are 50.0000000000000000000000000000001%
Carl: Smd, girl.
Hoe: Oh okay...*pulls off Carl's pants*
Carl: Ahhh, that feels good bitch.
Internet Troll: All of you smd, fags! erutrehiofogidhifhh
User 1: Shut up, cunt.
User 2: I'm going to report this bitch.
Moderator: Cuss or fighting is not allowed on our site, due to not following the rules you get a warning. Next time you will be banned.
Internet Troll: Go fuck yourself losers. lol
Steve: Smd faggot.
Gay guy: WAHHHHAHHHAAAA! YOU'RE MEAN I AM TELLING MY BOYFRIEND! He jammed his dick right up my mangina mother fucker!!
Really gay faggot(bf): What's wrong man?
Gay guy: HE'S MEAN!!
Really gay faggot(bf): Who? Him? You smd you bitch...
Steve: Oh shit...