Definitions by Your name can't be blank Don't

DMA 

Do Math Again - Typically used in MMO's when someone miscalculates a math problem.

Player1: You owe me $12.50
Player2: Hey, you ripped me off, its only $10 for what I bought. 5 items @ $2.50 each.
Player1: DMA

DMA by Your name can't be blank Don't December 6, 2009