Dude, man, bro — the all-purpose Mexican filler for a friend.
Güey is the single most Mexican word there is. It works as an address ("¿Qué onda, güey?"), as punctuation at the end of a sentence, and as an exclamation on its own. Young Mexicans use it several times per sentence without noticing. Written casually as "wey" or "we" in texts.
From "buey" (ox). It started as an insult meaning slow or stupid, then wore down into pure friendliness — the same path "dude" took in English.
Friends only. Saying güey to your partner's parents, a boss, or anyone over about 45 lands badly. It also still works as a genuine insult when the tone is sharp — "no seas güey" means "don't be an idiot."
Colombia says parce, Argentina says boludo, Chile says weón, Spain says tío, Costa Rica says mae. Every Spanish-speaking country has exactly one of these, and using the wrong one marks you instantly.
Reading a definition isn't the same as saying it to someone. Lingo Kaiava is a voice tutor set to Mexican Spanish — it uses güey the way locals do, corrects you in the moment, and never "fixes" the way real people actually talk into textbook Mexican Spanish.
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