Lyric discussion by snakemistakes 

Cover art for Weatherbox lyrics by Mission of Burma

from mission of burma's website:

I was living in the North End of Boston at the time, an extremely Italian section of town where I frequently felt like a trespassing insect. I had a small box (probably designed for carrying 45's) on which I had sprayed a blob of grey paint. (This was my post-punk briefcase). As I walked down the main street I heard a bunch of young toughs yell "Here comes Deputy Dan with his Weatherbox!" Of course I was intrigued, and looked around. Then I realized they met me as one of them tried to grab it out of my hands.

Later, I left it in a pub. When I went back to get it, the bouncer said "Are there any bombs in that?" Thus the title of the song, and the reason "bombs roll inside the weatherbox".