Someone who aides in the pulling up of the pants in a geriatric facility. Generally only needed only when the resident is hard to handle or there has been a code brown(accident resulting in fecal matter in the pants)
Rhonda and Lori, CNAs, are changing Elsie's messy pants when they find a code brown.
Rhonda: oh no!
Elsie: I'm going to knock the hell out of you!
Lori: I think we're going to need a pants runner. (goes into the hall to find Donna to help wipe and pull up the clean pants)
It's in reference to a class Modern Warfare 2,made of of your choice of primary and secondary weapons and Marathon Pro, Lightweight Pro, and Commando Pro as your perks. Most commonly, your secondary would be a pistol with the tactical knife attachment. A Happy Runner runs around knifing people and risking the death count for kills.
Ranger is a Happy Runner on Modern Warfare online, she racks up knife kills by the second!