svettlök

A Swedish word for the sweat stains that form underneath ones armpits. Can be used to describe a general sense of being sweaty as well.

The word translates to "sweat onion", alluding to the unpleasant smell of the sweat

Jävlar vilken svettlök jag har fått från träningen.

Damn what a "sweat onion" I've gotten from the workout.