Tubesmith Share definition Flag Is a word used to describe a female that has larger than average breasts. "Holy crap, she is the tubesmith of (place name of major city, state, event, school)"....."Check out the tubesmith over here"..... "talk about a tubesmith" Tubesmith by "MGM" September 2, 2008 0 0 Get merch Get the Tubesmith mug. Buy Now — $32.95 See more merch