«زَيِّ الْبَصَلْ مَحْشُورْ فِي كُل طَعَامْ»

The saying pictures onion as an ingredient crammed or wedged into nearly every dish, and turns that kitchen fact into a jab at a person. Someone compared to onion is not simply present everywhere but keeps pushing in, squeezing into company where nobody asked for them.

The target is the hanger-on: a person who frequents every sitting, latches onto people, and inserts themselves into others' business. Though onions are valued in cooking, the tone is scornful, implying the presence is tiresome and unearned rather than welcome or useful.

Said mockingly of someone who turns up uninvited at every gathering, attaches themselves to others, or pushes into affairs that are not theirs. It is a put-down of habits, not praise for being versatile or indispensable, and suits informal talk.