SOB=Small-of-Back, a/k/a "6 o'clock"
People will tell you horror stories about SOB carry and broken backs/pelvises. When I carry a revolver, I like carrying 5 o'clock with an SOB holster (and would carry 7 o'clock as a BUG if I had a left-handed version).
I'm boycotting THR.org until things get sorted out, but I'm active over at THR.us.
I am not a lawyer; nothing in this post should be construed as legal advice.