Armpit fetish, also known as maschalagnia, is a sexual attraction or arousal stemming from the armpits. Individuals with this fetish find the sight, smell, taste, or touch of armpits sexually stimulating. It can involve various activities, such as kissing, licking, smelling, or touching the armpits, as well as fantasizing about them.

For some people, armpit fetishism is linked to the scent of the armpits, which may be influenced by pheromones and body odor. Others may be attracted to the visual appearance of the armpits, including factors such as hair, skin texture, and shape. Some individuals enjoy the sensation of touch or the vulnerability associated with exposing the armpits during sexual activities.