5: S
3: E
10: Roman Numerals X
Can we have 5310
by Mister P-Diddy February 16, 2010
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A 1337 way of saying sex. Used to bypass hi-tech chat filters.

5=S
3=E
10=X(roman numeral)
I had 5310 with my girlfriend last night.
by Saitama 777 December 26, 2020
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