dilback Share definition Flag The region betwixt one's scrotum and anus that prevents one from defecating on one's testicles. Name for someone who you really really despise Man my dilback is itching, it might could use a little gold-bond. That guy likes to front like he's a pimp but hes really just a dilback. dilback by Rem March 29, 2005 Get the dilback mug.