Boulder Banger Share definition Flag One who seeks out extremely obese sex partners. Similar to a chubby chaser or a plumper pumper. Holy crap! Look at the size of his girlfriend! I bet she weighs 500 lbs! He's totally a Boulder Banger. Boulder Banger by Sanity Deprived Lunatic May 20, 2010 0 0 Get merch Get the Boulder Banger mug. Buy Now — $32.95 See more merch