«زَيِّ الْبَرْغُوتْ يِتْعَشَّى بِالْخَاطِرْ»

The saying pictures a flea that feeds on whoever arrives, drawing its meal from the visitor's own body. It describes a host whose generosity is only a cover: he takes a stranger in so that he can live off him and strip him of whatever he carries.

As a judgment, it is an accusation of hospitality turned into predation. The guest believes he is being cared for, while the one sheltering him quietly profits at his expense, like a parasite. Applied to a real person, it alleges bad faith and a serious betrayal of hospitality.

Use it to accuse someone whose welcome to a visitor masks an intent to exploit, such as a host who takes in a traveler and then drains his money or goods. It charges real bad faith, so it suits pointed criticism rather than friendly teasing.