Brown Seagull Share definition Flag Farting while receiving fellatio so as to make your testicles flutter by the force of the wind. I was getting head from this chick I hate and I totally gave her a brown seagull. It was amazing. Brown Seagull by Samdog III October 22, 2008 0 0 Get merch Get the Brown Seagull mug. Buy Now — $32.95 See more merch