Top definition
Stands for Harry Potter FanFiction- When a fan writes their own stories about Harry Potter and his world. FanFiction is also popular with other books, films and TV programmes such as Lord Of The Rings and Grey's Anatomy.
1) Hey, i've just finished reading your new chapter of your hpff! It's awesome so I've left a review!

2) I'm just writing some hpff, I'll talk in a min.
by Jaspergrl1 April 20, 2008
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