개이득

very big amount of profit or profit that you get without

any expectation.

If you got such a money and you didn't expect that, you could say 개이득.

Literally, 개 is a dog but it means 'very much' in this slang word. In other words, 개 is often used to emphasize meaning of word as informal usage.


돈까스를 시켰는데 우동도 나왔다. 완전 개이득