1. Resigning oneself to one's unfortunate circumstances
2. Expressing one's discontent for his surroundings
3. Expressing indifference to a seemingly important subject
4. A form of greeting (Usually accompanied with retarded hand gestures)
Bob: I failed my math test!
Sally:I don't think I love you anymore. You just care about yourself and never think about me and my wants and desires.
Jack: OMG, a black guy just got elected president!!
Whack: Seriously!!!! What's his--
Interrupting Kanye West: Doihy!!!!