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Ab abbreviation: Use that f***ing Urban Dictionary! It's a modification of the well-known UTFG (dunno what that is? UTFUD! Don't know what "dunno" is? UTFUD!) Urban Dictionary is the site you are now having opened.
A: HSHMBS I had today.
B: What is HSHMBS?
by MimKoRn November 15, 2010
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