BCG's Share definition Flag literally, Birth Control Glasses. The glasses issued to new recruits in the military, so called because no girl would want to have sex with men wearing these ugly, ugly glasses. Wow, newly shaved head and BCG's. I'll never have sex with those new recruits. BCG's by Pork King April 30, 2003 0 0 Get merch Get the BCG's mug. Buy Now — $32.95 See more merch