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Short for "suck my cock dude".
Used when responding against someone else's shitty opinion.
Person A: "I don't think Person C is going to win the election."
Person B: "Uhh... smcd"

Person A: "This food is terrible."
Person B: "How about you smcd?"

Person A: "Only faggots wear green hats."
Person B: "I wear them all the time smcd"

Person A: "Wow, you're terrible at video games."
Person B: "smcd"
by A Sexy Big Guy August 19, 2016
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2
sneaky mcdonalds, to go to a mcdonalds drive-thru without annoying "friends" coming too or asking you to get them something.
They went for a smcd so that K wouldn't go with them
by bamboozler808 January 30, 2011
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