Please, treat my home as if it were your own; help yourself while you stay here. Taken from a Spanish phrase that is translated literally as "my house (is) your house." A: "Do you mind if I have some of your cereal in the morning?" B: "Of course I don't mind! Mi casa, su casa!" And here is where you will be staying. Please help yourself to anything in the house—mi casa es su casa.

slang Money. Primarily heard in US. Come on, you know I don't make enough do-re-mi to go on an extravagant trip like that.