A tequila slammer (known in Mexico as a muppet or mópet) is a cocktail served in a rocks glass.

The slamming action releases gas bubbles from the mixed drink causing it to foam vigorously.

It can also be served with equal parts tequila, white wine (or champagne), and lemonade, creating a more potent, flavorsome mix.

[citation needed] One of the first (or certainly most noteworthy) appearances of the tequila slammer is Elvis Presley demonstrating the technique in the 1963 film Fun in Acapulco.

Featured prominently in Jean-Jacques Beineix's 1986 film Betty Blue, but referred to by its alternate name Tequila Rapido.