Drainadin Share definition Flag N. A person who tries to act cool or "gangsta" but inside is a complete moron and everyone hates his guts. That nerd over there is such a Drainadin. Nobody likes him and he is such a jerk. Drainadin by Yogurtman March 22, 2009 0 0 Get merch Get the Drainadin mug. Buy Now — $32.95 See more merch