Firemans Cap Share definition Flag The tip of a penis, looks like a firemans cap. I was washing my car. As my firemans cap rubbed against it, my hiding serpent came out to say hi. Firemans Cap by BobbyRayJones February 20, 2010 0 0 Get merch Get the Firemans Cap mug. Buy Now — $32.95 See more merch