BRB - Be Right Back

FFS - For Fucks Sake
A "term of endearment" often used by Aussies.

KK - Okay... okay (meaning yes)

IMAO - In My Arrogant Opinion

LOL - Laughing Out Loud

OP - Original Poster
When someone starts a message board "thread", they're often refered to as the "OP."

perp - short for perpetrator (one who commits an offense or crime)

Professional Wrestling

PPT - Plunge Protection Team (a.k.a. the President's Working Group on Financial Markets)
Their "official" role was to prevent another 1987 "Black Monday". They have the entire U.S. Treasury at their disposal to manipulate the markets through DERIVATIVES (futures options). Some say the Plunge Protection Team is headed by Goldman Sachs and was apparently created March 18, 1988.

Plunge Protection Team Blog
Debated on CNBC (YouTube Video) (11/18/2008)
THE FED IS BETWEEN A ROCK & A HARD PLACE - New York Post

ROFL - Rolling On the Floor Laughing

sovereign - Self-governing; independent.
For example, a sovereign state.

SMOM
Sovereign Military Order of Malta