used to express great discontent, dissatisfaction, disappointment, often in a funny way; usually used after someone (including oneself) has done something wrong, committed a party foul, or said something not cool (either stupid or politically incorrect)
the "a" in shame is usually stretched out, making it sound like "for shaaame"
Person A: Sign me in!
Person B: Okay, hold up.
*Person A looks at the sign in sheet*
Person A: Hey, you spelled my name wrong! For shame!!