SMNIYF 

Shaking My Nuts In Your Face

An alternative to SMH, SMNIYF is used commonly amongst NYC high school students.

Boy: Would anyone like to play some Xbox 360 or Nintendo Wii?
Other boy: SMNIYF

SMNIYF by RyanTerr December 14, 2010

SMDIYF 

Shaking My Dick In Your Face

Andy: i hate you, suk ma dick
Lee: SMDIYF

SMDIYF by ass-backwards January 19, 2011

SMDIYF/SMDOYF 

Slap my dick in/on your face.
When someone is giving you head and you slap them in the face with your penis.
Can be used in place of SMD.

"I just beat you on Trivia Crack! SMDIYF/SMDOYF bitch!"

SMDIYF/SMDOYF by peasncorn January 3, 2015