sweat boner Share definition Flag When it's so hot and humid outside and your ass and taint area sweat, you get an erection just by your wet underwear. Why is this wedding outside? It's over 95 out here! I'm getting a sweat boner just standing here. sweat boner by Brigado May 3, 2011 0 0 Get merch Get the sweat boner mug. Buy Now — $32.95 See more merch