What is Siu Sii Smd?
1.
The abbrevation for the commonly used phrase
"Suck it up, suck it in, suck my dick"
A phrase used by lovely guys with excellent manners.
Girl : I don't wanna send you pix of me in a bra...i'm self concious :/
Boy: Uhh SIU SII SMD...
Girl: wtf...
See