What is "square peg in a round hole"

n. (context idiomatic English) Something or someone that does not fit well or at all; something that will not succeed as attempted, except possibly with much force and effort, or alteration of either the peg or the hole or both beyond recognition.

Square Peg in a Round Hole, (often misquoted as Apparatjik World) is the second studio album from rock supergroup Apparatjik. It was originally released via Apparatjik's iPad application, Apparatjik World, on 11 November 2011, as the "first edition" of the album. The production of the album included the help and support of Apparatjik fans to produce a further 10 more editions of the album before the final version was released on 21 February 2012.