B/M = Brick and Mortar. It means a real tobacco shop you can walk into as opposed to an online vendor. There is an acronym guide around here somewhere, or at least a link to one.
ETA (edit to add): here's a link for you: http://www.cigarsmokers.com/showthre...9828#post79828
For your further edification, do a search on the term acronym and see how many times this question has been asked, answered and links forwarded to amplify. Search will often answer questions such as this.
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