When one reverts to their college behavior after a couple years in the real world. Especially if your college behavior involved being a whore mongering drunk.
It's a word that came from the "Toronto slang" (Jamaican slang) "Dutty" which means "Dirty" but switched around. It's spelled "Dirky" but pronounced "Deki."
"Don't go to Derky town after Dark"
"We played football with the rough kids from Derky town in the park"
"Make sure you are always with someone when you go through Derky town"
"Please don't go on the other side of the dirt road"