1. To be idle or slothful; to be totally inactive. I don't want you loitering away on this sofa for the whole weekend, young man! After a long week of work, there's nothing I like better than to loiter away for a while with some video games or movies.
2. To pass a certain amount or period of time by being very lazy or idle. In this usage, a noun or pronoun can be used between "loiter" and "away." Too many kids just loiter the summer away in front of their computers or televisions. You really need to be working on your college applications, not loitering away your weekends with your friends.
loiter something away
to idle away a period of time. Those boys will loiter half their lives away. They loitered away their summer vacation.