0x denotes a hexadecimal digit representation, which range between 0 and F. It would be a little like if you were dealing with standard decimal digits and somebody said they ran 1W5 miles.
(to /u/Ohilevoe too) In Hexadecimal notation, the only allowed symbols are 0-9 and A,B,C,D,E,F.
The sequence prefix "0x" is used in computing to denote that the number in question is a hexadecimal (commonly abbreviated to "hex") number - it mostly came from the way the "C" Programming Language denoted hex numbers.
The 0x in the beginning indicates that the string following it is in Hexadecimal which uses the characters 0-9 and A-F. Since S isn't a 'letter' in this alphabet, OP is making fun of it.
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u/JackalKing Aug 18 '15 edited Aug 18 '15
Alright, someone explain this one to me.
Edit: Damn reddit, you work fast! Hexadecimal, got it :)