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1.
The current most popular way to brush someone off; in other words to mean "no fucking way".

Originates from the "I have to wash my hair..." excuse, and similar to the "maybe later" brush-off.
Dave: Hey Susan, so do wanna get a drink next Saturday?
Susan: Umm... maybe some other time...
Dave: Oh, okay...
by Qwerty drucy October 25, 2009