Top Definition
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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