Term widely used by Verizon Wireless employees to denote a person with a poor/derrogatory credit rating. In most cases these potential customers are required to put $1000 or "1K" down as a deposit in order to sign up for service. Evidence of these customers low socio-economic status is easily noticed due to their lack of hygiene, common sense, people skills, and literacy.
"As expeceted, that drunken clown was a Walking1k."
"Gee Steve, I wonder if that man in the soiled sweatpants is going to be a Walking1k."