brosyphillis Share definition Flag When a guy gets syphillis from another dude. Usually from taking a hit off the same bong. -Dude, I might have an STD. But I haven't slept with anyone in months. -Maybe it's brosyphillis? brosyphillis by the_stomping_rabbit December 17, 2009 0 0 Get merch Get the brosyphillis mug. Buy Now — $32.95 See more merch