FYWW is the collective name for the San Francisco Giants relief pitchers.
These arms are so filthy that in a game in which the Giants hold a slim lead, bringing any of these pitchers into the game is the manager's way of saying to the opposition "F*ck You, We win" (which they eventually will do)
"Lincecum's at 115 pitches for the night .. should we let him go out for the 8th inning or bring in FYWW?"
Cain with 7 strong innings and yet only leads 1-0. No worries, let FYWW close out the show.