From Kook Science
Phrogging (pr. frog-ging) is the practice of concealed residence by an individual, a phrog, on a property without the knowledge of the owner.
- attic fan (13 Jul. 2006), phrogs, urbandictionary.com, https://www.urbandictionary.com/author.php?author=attic%20fan
People who attempt to sneak into houses and live among the occupants without being discovered. Most phrogs see themselves as “invisible roommates” and try to respect the homeowners or renters by not breaking or taking—although mooching food is sometimes necessary for survival. Phrogs may be recognized by the green string that some of them wear on their wrists.
Anna keeps a list of houses that are good for phrogging and shares this information with other phrogs.
- Roadfood, et. al. (15 Aug. 2007), Phrogging - is this for real?, straightdope.com, https://boards.straightdope.com/t/phrogging-is-this-for-real/415706