1. The feeling one gets when they hear an obvious or absurd lie uttered by another person.
2. The feeling one gets when facing down an extremely tough group of foes that you have little to no chance of defeating them.
1. My bullshit detector went off when I heard that illegal immigrants have a right to be here.
2. I am being attacked by ten juggernaughts in Modern Warfare 2 on Veteran mode, using only an M9. Bullshit detected!