Top Definition
Rhyming expression for use when you really didn't know something, and were maybe even the last person on earth to find out. Goes to show you really do learn something new every day.
'You mean you can't get pregnant by sharing a facecloth? Fuck my hat, I didn't know that!'
by mockschmock December 07, 2006
5 Words related to fuck my hat, I didn't know that

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