A corsican dialect is a commonly used discrete reference for a blowjob. An excelent way of avoiding the use of more offensive words in public.

when you're hungover as shit after a spending a night drunk as a skunk

A corsican dialect refers to a blowjob. It can be split to two words. The word "dialect" is commonly used as a synonym to "conversation", in this given cause, meaning oral pleasuring of a penis. The word "corsican" refers to a southern island in the mediterranean sea that is considered a region of france. It's connection to a blowjob is yet unknown.