-Adjective used to describe when someone falls asleep in an upright position, most commonly in a public or semi-public environment. You are able to observe the "scrump" (folds/rolls of excess skin) of the neck as their head falls forward or to one side.

In many circles of friends the act of scrumpy neckin' is an open invitation for public humiliation and shameful photo opportunity. Especially when one is caught scrumpy neckin' with shoes on.

the thing that you don’t have when you’re phones percentage is over 20