Canuck
路Does the use of these acronyms relate to text messaging wherein the maximum number of characters is 160? I too am lost with about 75% of these cryptic non-words. Almost as bad as trying to decipher personalized license plates!
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OEM: Original equipment manufacturer. Essentially, this means the the item is produced by the original company.
For example, an OEM Omega bezel was produced by Omega, not a different company.

YGBSM = You've Gotta Be Shittin' Me
From the Urban Dictionary...
"During the Viet Nam war, US pilots were getting shot down because of surface to air missile SAM sites. In an effort to counter-act the losses, the USAF came up with a tactic called the hunter-killer team concept. This tactic required a pilot, the hunter, to fly low over an area of suspected SAM sites in order for the sites to start shooting. Once the SAMs started shooting, pilots in follow-on aircraft, the killers, dropped bombs and fired missiles to disable the SAM site. When told of the new tactic at a pre-brief, one pilot was reported to respond, "You've gotta be shittin' me!" The term is associated with Wild Weasel pilots who flew F-105s, F-4Gs, and currently F-16s.
Currently, the term is used as an exclamation of shock or disbelief."
Note: I fly with quite a few former USAF F-4 drivers at Delta...some of whom flew the F-4 Wild Weasel in the Gulf...so I'll often see the patch (or sticker) depicted below on either a carry bag or roller board at work...good times! 馃憤