Top Definition
The condition of having such a huge crush on someone that you completely forget how to do the simplest things.
Boy: You know we could have just used a different IM client to keep our private chats seperate from our work chats?
Girl: Jeez, we could have thought of that such a long time ago!
Boy: Don't worry, we have crush dementia, it's understandable.
by PiMPeRJ September 22, 2008

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