Jeans that are slimmer than a typical pair of jeans, aka carrot leg pants or skinny jeans.
When it comes to men’s fashion these days, slim is in. Slim fit jeans are an extension of a movement in general towards more tightly fitted clothing. Slim fit jeans can range anywhere from just slightly fitted to skin tight. Usually, the latter is reserved only for gay guys, but the trend has been towards slimmer and slimmer jeans.
Slim jeans were first popularized in Europe, and can give you a more European or hipster look. Slim fit jeans have also become popular among Emo rock bands, so they work with that type of look as well. Unless you want people questioning your sexuality, though, it’s best to stick with just moderately tight jeans.