1. someone or something that is extremely annoying or inconvenient
he/she/it is such a pain in the neck!
If something is said to be 'a pain in the neck', it is considered to be very annoying or disruptive. A stressed parent might say they have "...a pain in my neck..." with the children screaming and running around and the house in a mess; or a manager in a busy office might consider their lazy staff to be 'a pain in the neck' when there are targets to be met. There are lots of ways to use this expression, and it can be used in any context in relation to things that you find annoying.