Lez down Share definition Flag When an incredibly hot lady turns out to be a lesbian, used in place of "let down". Guy 1: "Man Sarah's hot, she should go out with me." Guy 2: "Oh dude, she's a dyke." Guy 1: "That's a fucking lez down." Lez down by Bentfrogleg September 6, 2013 Get the Lez down mug.