Informal borrowings constitute an important linguistic phenomenon, yet they remain underrepresented in scholarly literature. This book is to remedy the situation. Drawing from the methodological framework of documentary linguistics and sociolinguistics, it relies on lexical material from a large database of citations from diverse sources – including spoken utterances, films and TV shows, print, and social media – to ensure authenticity and representativeness. Much space is devoted to the presentation, explanation, interpretation, and illustration of language data; the format of description is designed to be extensive, covering a wide range of themes which allow an examination from various perspectives. The description is amply supported throughout the text with usage examples that illustrate linguistic patterns, show the sociocultural context in which they are used, and attest to the very existence of these expressions.