DBoS stands for "Distributed Boycot of Services". The word DBoS was first used on twitter after Operation PayPal (#opPayPal), launched by the hacking (activism) collective 'Anonymous'. They asked everyone to boycot PayPal and close their existing accounts. According to some sources tens of thousands of people closed their accounts within hours. eBay stocks plummeted more than 2%, vaporizing some 1 billion dollars of shares, within the first 20 minutes after the NASDAQ opened. Some people claim it's due to #opPayPal.
-noun Dead Ball Out. In slow pitch softball when the maximum allowance of team homeruns has been met, any further homeruns will count as an out. Any homeruns exceeding the limit will be declared a dead ball out, or DBO, by the umpire. Frequently, DBO offenders can be quoted as saying "Screw the team, I'm going deep."
Swing lost the state championship for his team because he hit a game ending DBO with the tying run on third base.