happypants Share definition Flag when a human tends to get very horny and stays horny for a long period of time(48 hours) Jimmy,"Dude did u see Sandra in that thong yesterday?" Ren, " yeah man, i can't stop thinking about it, ive been happypants for a while!" happypants by Disarmed Milk June 18, 2005 0 0 Get merch Get the happypants mug. Buy Now — $32.95 See more merch