Stands for Simultaneous Mutual Companionable back-clap, and is used to describe the warmly-affable gesture that two super-sociable best friends (usually two cool dudes, but hot chicks occasionally share one, too, or a guy and a sturdy-figured cutie) perform to signify an agreement, encourage each other to begin a boring/difficult/disgusting task, start off on a stroll together, etc. It simply involves exchanging a huge beaming ear-to-ear grin, then putting an arm around each other's shoulders and landing a good-natured thump on the back to indicate their hearty positive feelings and congratulatory appreciation for each other.
Freckle-faced southern tomboy: Ah always loves to help da local farmer-boys wif their chores and play volleyball wif dem, and my fahvorite part is the s. m. c. back-claps dat dey always smilingly gives me throughout the day... makes a gal feel purrty and appreciated!
by QuacksO March 8, 2017
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