be a pain in the neck

be a pain in the neck

rude slang To be an annoying person, or an annoying or inconvenient thing or situation; to be something that causes aggravation. Primarily heard in UK, Australia. You know, Jack, you may be my friend, but you can be a real pain in the neck sometimes! This calculus homework is a real pain in the neck. It's not that I don't understand it, it's just so tedious!
See also: neck, pain