Unintentional crease/fold in a notebook, paper or book currently in use. Can be used as noun/verb or reflexive verb/adjective.
1. I have a doucheflap in my notebook. RAH!
2. Shit. I just doucheflapped my book.
3. This notebook is doucheflapping on me!
4. This book is so doucheflappy!
by Ira Banks and Laila Matar January 18, 2009
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