Chaquetero

Someone who is a fan of one football club (or any sport really) and all of a sudden he’s wearing their rival’s shirt.

It could also be a player or manager or even a board member who was working with one team and then suddenly betrayed them by joining the rival team or just some team in the same league as them. However it’s given a much more serious connotation when directed at someone who doesn’t do it for a living.

The literal definition is just taking your jacket off to put on another one, but what’s implied is a demonstration of one’s ability to betray without remorse.

What’s meant by the Mexican term is that they’re willing to jerk this guy off and then jerk the guy’s enemy right afterward.

Son, take that shirt off. You’re not supposed to be wearing a shirt from a team that’s in the same league as yours, at least not if it’s your local team.

It’s a good team. They just bought my favorite player.

Come on, think straight. Don’t be chaquetero.