Blowmold Share definition Flag A fungus that grows on, and around the penis. Usually caused by excess saliva and mucus left after receiving a blowjob. I forgot to wash my dick after that juicy blowjob and now I have a bad case of blowmold. Blowmold by Chad Ditlevson November 1, 2009 0 0 Get merch Get the Blowmold mug. Buy Now — $32.95 See more merch