Trying to recall where and when you spent all your money normally when that said money is needed. Occurs because of bad spending habits and fucking awesome party nights.
"Dude, I'm so bad with money! It just disappears."

"You might have spending amnesia. I remember you lost at beer pong then hit the pubs with those trannys.'"
by whydee September 16, 2011
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Conveniently forgetting the price tag of an awesomely expensive item that you just had to have, particularly when queried a spouse or partner on reviewing your credit card bill.
"Nice purse! Is it new?"

"Oh, thanks! It was only like $25 or something! Saks was having a huge sale!'"

(Reviewing credit card bill) "Girl, I think you have spending amnesia!"
by mommuff June 24, 2014
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