A more technical definition of Missingsch is that it is a type of contact variety, specifically a type of German variety with a Low German (or Low Saxon) substratum.
Mamma: "Klein Erna, komm ra-auf, Füße waschen, Mamma braucht die Kumme gleich zu Sala-at!" (Mum: "Li'l Erna, come on upstai-airs!