qwilf Share definition Flag Similar to milf, with the "qw" part being largely undefined. It is used simply because of the fact that it is so satisfying to say. "Look at that big, sweaty, stringy, glassy ol' fulfy qwilf over there! I'd shit-tilf that, if you follow me." qwilf by TheMilf February 3, 2007 Get the qwilf mug.