Sometimes short for Friedman Unit: the next six months, which will surely be the deciding factor in the US occupation of Iraq which began in 2003. Government or pundit statements on when the occupation will end are easily translated into F.U.s.
The six month term is always the *next* six months, no matter when it is said. This is long enough that most people forget about it and the originator is free to suggest another F.U. at any time.
The Congressman gave it one F.U., saying that we'll know (in the next six months / by September / before the end of the year / etc) if the latest approach is working. Not likely, given that he said the same thing a year ago...
"Welcome to Florida University, the big F.U.