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This one is similar to the one mentioned by csm_714:

There was a 16 year old girl .. enter 16 on calculator

And she had sex with 19 different guys.. multiply this number with the 16 mentioned beforhand.

What does this make her?

a 304. (a hoe)

This loses its humor when someone mentions that the word perceives different meaning due to its spelling and that there isn't really anything funny about being a garden tool.