Skinny Mirror [skin-ee mir-er] noun.
• A mirror that’s surface is slightly bent at an angle that causes the reflected image to appear elongated and/or horizontally compressed.
• A mirror that makes you look skinnier than you actually are (duh)
• Ex: Retailers use skinny mirrors in fitting rooms to get you to buy more clothes
• See also: mind fuck, existential crisis, reverse body dysmorphia