I want FAT BOY! 
Wasn't it FAT MAN $ LITTLE BOY"?
If you are refering to the atomic bombs dropped in WWII, yes, it was fat man and little boy.  However, I believe Hang is talking about HTC adding a special SOB loadout to the B-29.  Could you imagine the devastation that would be wrought when you dropped SOB from 30,000 feet?