What does Blue Sandwich mean?

Blue Sandwich meaning in Urban Dictionary

A blue sandwich is when you're having sex with another person while slide the couch cheeks over your lovers mouth and then you "beat the meat" (masturbate) and after that you "mayonnaise" or ejaculate throughout the various other individuals belly, and then you place the top bun (you) on and 69 another partner making certain to get the mayonnaise on both edges of bun and beef