Top Definition
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...
by lizbrez March 22, 2009
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