a special cake that is presented only after you have forgotten about someone's birthday; the intention is to make you feel guilty for forgetting
I forgot my dad's birthday and 3 months later, my step-mom brought out a guilt cake cake for him as a surprise. I sat there uncomfortably... thinking, "what a nice surprise... now I can feel really guilty about forgetting my dad's birthday"
by lexshare August 12, 2011

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