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Acronym for "Shaking My Hair Cape" or to be angered and/or extremely annoyed. Used often on the gossip blog "Oh No They Didn't!" but originated from African American women who often wear hair capes to wrap their weaves/hair in when they sleep (or men use to keep curl in their hair). Shaking your head vigorously would be to shake your hair cape.
I can't believe she did that, I am SMHC hardcore right now.
SMHC by sleevesofsatin October 20, 2010
Related Words
Nica slang used to describe sucking teeth. An action of utter disgust, annoyance or frustration. Also used as a gesture of disapproval.
Ex:

Person 1: Is it 5 o'clock yet?

Person 2: Not yet.

Person 1: Smehck!
Smehck by JosNica May 16, 2013
SMGH, that guy cannot rap.
smgh by k00lbeansz July 25, 2010

sighchology 

The study of people's breathing-patterns to determine their sanity.
With all the irritable wheezing and puffing that cantankerously-deluded individuals often exhibit, a simple application of sighchology makes it obvious that said voluminously-respiring folks are indeed plumb loco.
sighchology by QuacksO June 5, 2019
shaking my head crying
My BF just emailed how disappointed he is with me in the poor quality of a project I'm creating - a project of which I'm extremely proud. He is so disappointed, my gut tells me our relationship is over. SMHC
SMHC by Zia Dolce June 29, 2016