You see it all the time on software, what the heck does it mean?
Well thanks to Webopedia you FINALLY get the answer!:
“(pronounced as separate letters) Short for original equipment manufacturer, which is a misleading term for a company that has a special relationship with computer producers. OEMs are manufacturers who resell another company’s product under their own name and branding. While an OEM is similar to a VAR (value-added reseller), it refers specifically to the act of a company rebranding a product to its own name and offering its own warranty, support and licensing of the product. The term is really a misnomer because OEMs are not the original manufacturers; they are the customizers.”
(Via webopedia )