He was so happy about the new server, he went SDM on it
by Quab October 7, 2003
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Shag, date, marry index.

The mathematical equation of a person's (male or female) likelihood to fulfill any of the three noted requirements both a) individually and b) collectively.

Equation Calculation

Maximum 33 points awarded for:

1) Desirability to Shag (chiefly British, or American 'bang')
2) Desirability to Date
3) Desirability to Marry

An overall virtual percentage can be derived as an index judgment to the candidate's complete desirability. In most cases the result would be declared as:

X,Y,Z

30,25,7

An SDM index of 62
Chandler: 'For me Elly is a 30, 25, 7 SDM Index. I'd love to bang her but wouldn't wanna watch X Factor with her every Saturday'.
by londonacidcity December 11, 2011
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SDM is a huge movement started for people with not so huge dicks. SDM stands for Small Dicks Matter.

In a society boasting about having 12 inches schlongs... 68 percent of people just have an average dick size of 5 inches. So, if you are in those 68 percent... Come join SDM
Gym Rats have also joined the humongous SDM movement with not so humongous pp
by SDM's CEO October 10, 2021
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When someone keeps pinging or texting you, while u r extremely busy;
Boy 1 - text dude, pick up my messages... u shit, wat type of friend r u?
Boy 2 - text cant call u my friend, so SDM!!!
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I thought you were a SDM kid
by BakushimaBestBois September 1, 2020
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