Any cake or pastry product consumed after 10:00 PM.
"I was headed to bed, but instead was delayed by a huge slice of shame cake."
A slice of cake purchased at a gas station or grocery. The sweet taste of the cake is the only taste of sweetness that you will ever have again, due to you'd poor life choices.
After making a low score on the, MCAT I stopped by the grocery store, and picked out a slice of shame cake.