Ay, güey is one of the most common expressions in Mexican Spanish, and it's the perfect phrase to learn to sound like a native. It's a versatile exclamation of surprise, excitement, or frustration, similar to saying "Whoa!", "Oh, man!", or "Jeez!" in English.
Breaking it down, güey (sometimes spelled wey) is ubiquitous slang for "dude". While it can sometimes be used as a light insult, among friends it's a common term of endearment. In this song, the title phrase Ay, güey is used to express surprise and sets a very informal, street-smart tone for the track.
"Ayy Weyy" throws you straight into the chaotic, loud lifestyle that Fuerza Regida lives for. The track kicks off with street bravado—bragging about chasing cash (feria) since he was a kid and messing around with the jealous neighbor's wife. In Mexican slang, when he says she is waiting for him bichi, that means completely naked. But right in the middle of all this reckless fun, you hit a surprise twinge of heartbreak: "Un whiskacho me chingo por ella / Por eso es que me duele el cora'" ("I knock back a whiskey for her / That's why my heart hurts"). He drinks to forget an ex, but instead of sitting around crying about it, he decides being single is better and dives right back into partying with new women.
The real comedy comes when the party gets completely out of hand. The cops raid the house in an American suburb ("un vecindario gabacho") because the music is blasting too loud. The police knock the door down expecting to find illicit drugs or dirty money ("el maldito lavado"), but instead of finding contraband, they only stumble upon Diamond and Platinum music plaques hanging on the walls. It is cocky, hilarious, and packed with everyday border slang like plebada (the crew or crowd) and ay, güey (oh, dude). If you want real street Spanish mixed with pure brag energy, this track delivers it with zero filter.