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When you really like someone and things are going great, and then you suddenly don't like them anymore for no apparent reason, or start to find miniscule things that are with wrong with them that annoy you.
"Tom and I went on 6 dates and I was really starting to fall for him! Then I got the whim whams."

"I really, really, really like Michael, but... I've got a case of the whim whams. I decided that I actually don't like his beard or his cat or his shoes."
by Brenskins February 27, 2014
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