stands for "Shaking My Head" usually an acronym when you see the most ignorant, dumbest, or disapointing shit you've ever seen, you can say it rather than doing the the action
"you see that 16 year old over there?"
"that baby tee's way roo small for her, and she's preggo's"
"what's that in her mouth?"
"omg that's a blunt"
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