Green Thermos Share definition Flag Green Thermos is military slang for a Cum Bucket. The Petraeus scandal is much about an "unpaid social liaison" that is just politically spin on Slut or Green Thermos. Green Thermos by T-Rex 317 November 14, 2012 0 0 Get merch Get the Green Thermos mug. Buy Now — $32.95 See more merch