Top Definition
An acronym - Happy Mother Fucking Birthday!
Hey! TGIF and HMFBD too!
by susan lucci's toenail August 22, 2011
1 more definition
Have A Mother Fucking Birthday
little kid: Yay! It's my birthday!
grampa: OMG! HMFBD!
little kid: what?
by morracaas December 05, 2005

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