2 definitions by izzehWIN_

An acronym for "suck my dick". Widely used across the intergalactic web, and in general conversation.

intergalactic web:

guy: my mom made me pancakes
dude: ur mom can smd

in real life:

guy: omg you're well ugly man
dude: how about smd?

by izzehWIN_ May 02, 2010

A more effective and stronger way of saying "penis". May be used over the intergalactic web, or through general conversation.

"YA WELL, YOU KNOW WHAT? MY PAYNUS IS BIGGER THAN YOURS!"
"your moms paynus is bigger than yours"

by izzehWIN_ May 02, 2010