The 1984 film "This is Spinal Tap" had a scene where a guitarist explains why they're so loud--the amps have volume dials that go to 11. When the interviewer asks why they don't just recalibrate so that 10 is the highest, there's a confused pause, after which the guitarist repeats, "These go to 11."
An 11-ism is any similar bit of clueless thinking.
Did you hear his defense of horoscopes? What an 11-ism!
I watched the political debates last night and have never heard so many 11-isms packed into one block.