"Carries his brains in his back pocket" nghĩa là gì?

"Carries his brains in his back pocket" = để não trong túi quần sau -> nghĩa là ngu dốt, kém thông minh.

Ví dụ

I think he carries his brains in his back pocket, I think he's inciting (kích động, xúi giục) problems in the store, he's looking for a fight.

If he really doesn't know the product, he carries his brains in his back pocket. If he was merely feigning (giả vờ) ignorance, he's a bigger fool.