SUCK MY FUCKING DICK BITCH. you can also keep it lower case if you aren't truly angry. But this valuable term is best used as a conversation ender. kinda like. "You started this shit!" then you'd say, "Well I'm ending it BITCH! SMFDB!" over.
John- "You up baby? I swear it wasn't what it lookedlike,"
Jackie- "No. SMFDB!"
Userguy1: So... do you shower every day?
Usergirl25: smmfh...
Userguy1: ...
Userguy1: ...what was that for?
Usergirl25: What kind of question was that? Of *course* I shower every day! Don't you?
Userguy1: ...