Top definition
(must be said with stressed high-pitch voice) said towards a person who repeatedly lies about almost everything, so it makes them a non-credible source.
"I got $100", Why Lie, you dont get paid until friday!

"I used to go out with her last year", WHY LIE? She just transferred here last month.
by @MookX_XNasty, @I_am_just2much February 28, 2011
Get the mug
Get a Why Lie? mug for your brother-in-law G√ľnter.