In order to describe a person who "hops" around from friend to friend or clique to clique, and only acts as a friend when he/she is in need of a favor, or else he/she is never heard from.
Man that Erik is such a friend hopper, the only reason he was hanging out with me was so I would help him study for the exam.
a shortage for "under the radar" used to describe the status of being offline on e.g. msn messenger in order to avoid contact from specific people, but still being able to communicate with those desired.
Yep im online, just utr, I'm avoiding that chick i hooked up with last week.