instabonerific Share definition Flag It's all in the name. Something so goddamn hot you instantly get a boner. Just one look and BOING! Megan Fox is totally instabonerific!Susan Boyle is so not instabonerific.... instabonerific by headbanger32894 August 13, 2009 0 0 Get merch Get the instabonerific mug. Buy Now — $32.95 See more merch