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An acronym for I've heard that before. Commonly used for those gifted with dirty minds. Similar to thats what she said, but more respected.
"Oo I love the sticky ones!"

"Mmm, nuts my favourite."

"Ouch hand cramp!"
by CatLadie October 10, 2011
Stands for I Hate That Bitch. Used in code between one or more people when describing someone they do not appreciate.
Karen can't write a fucking app after 8 years, IHTB!
by Poppy Greg July 20, 2006