There is no denying Obama was raised around Islam so knows it well..
so he would know that's gesture well and know what its mean in front of that audience....
You an I might not know what it means... but he would...he would know very well what it means to an Islamic crowd
it like an American would never give the middle finger by accident to an American crowd..
When I'm near Obama, maybe I can make this sign:
(It's American Sign Language for "asshole")