1. To reduce to ruin; devastate. 2. To injure (a thing) irretrievably. 3. The downfall, decay, or destruction of anything important.
"We could have won the game in overtime when Percival had the breakaway on the open net, but he totally ate the cake, and we lost."
"I knew I ate the cake when I got caught making out with the boss's daughter in his jacuzzi."
"Margaret knew she ate the cake when she realized that the neighbour's dog she was looking after ate her retainer."