This is a play off of the famous quote from American actress and playwright, Mae West: “Is that a gun in your pocket, or are you just happy to see me?” (She Done Him Wrong — 1933).
In this cartoon, Vert visits the local Exotic Dancing Club, where Mae West, DACBR [chiropractic radiologist*], says in her sultry voice, “Hey Bone Boy. Is that an osteophyte [bony spur or protrusion seen on x-ray] in your pocket?…. or are you just happy to see me?!” Of course, Vert is speechless, and decides to just wave.
*DACBR. These are the letters seen after the name of a chiropractor who has specialized training as a radiologist. They stand for Diplomate of the American Chiropractic Board of Radiology.