Acronym for 'shake my head' or 'shaking my head.' Usually used when someone finds something so stupid, no words can do it justice. Sometimes it's modified to 'smfh' or 'smmfh' by those that prefer profanity in their internet acronyms.

The internet acronym for the words 'shake my head'. Usually used when disappointed in someone/something.

An acronym, used in blogs such as "Bossip," which means shaking my head.

meaning "shaking my head"
an acronym made up in a blog chat site by a user known as flyvince

suck my huevos. huevos = eggs in Spanish.

"Steady My Head"
To be said after something ridiculous or embarassing (to someone else) happens.
Essentially telling someone that you need to have your head "steadied", in reference to the head shaking in dissaproval or moving with laughter, because what has just occured it so outrageously funny or embarassing to the other person.
This can be pronounced verbally as "smhhh" or "smuh".

SHAKE MY HEAD (In Negative Fashion)...(as in side to side)