It is a euphemism for a transsexuals penis.
Sometimes used for crossdressers, transvestites and/or drag queens.
I was about to have sex with this chick, until I noticed she was packing some she beef.
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In moments of extreme anger some people begin to say "don't", but mid-word they change their minds to say "do not", so it is a combination of both words.
This of course makes the recipient of the comment makes them snicker thus angering the 1st party even more.
How many times do I have to tell you, donot do that!
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