The smacking sound one makes with the mouth when displeased or irritated with something or someone. Known as "smacking of the lips" but the actual sound leaving the mouth is "smch"
"SMCH! He tried to tell me that my tomatoes were rotten when I know good and well they're fresh!"

OR

Mom: "No, you can't go to the park to play ball today because we have to go buy you new school clothes."

Son: "smch. Do I have to go?"
by RePhReShiNg December 24, 2008
Get the smch mug.
An expressive response projecting sudden irritation or disappointment.
Smch! I know you didn't just fart in my face!
by uReggie April 3, 2019
Get the Smch mug.
Sam Meyers Certified Hottie ™️. A female of impeccable quality, however completley outside Sam’s obtainability.
She’s a SMCH fo sho. Hope her lip pimple heals soon.
by SMBF14 December 4, 2021
Get the SMCH mug.