foo fops Share definition Flag n. 1) To administer a severe beating. 2)Your fists. 3)To knock someone out. 4)Prison slang for an ass-whipping. "Homeboy was talking sideways, so I had to put the foo fops on his ass." foo fops by Mad-Town Matt December 14, 2007 0 0 Get merch Get the foo fops mug. Buy Now — $32.95 See more merch