An addition to OMGWTFBBQ (or just WTFBBQ), the LBA stands for "Leave Britney alone!" as screamed by Chris Cocker.
1. Used when, unbelievably, OMGWTFBBQ just isn't enough.
2. Also used when the subject of the expression is an attack on an apparently innocent or defenseless party.
Ralph: "Those little kids I kidnapped are all great at digging trenches!"
Andy: "What kids?!"
Ralph: "Oh, I didn't tell you?"