Lallan is a term that is primarily used in South Asian countries, especially in India. It refers to a language or dialect that is an amalgamation of different languages or a mix of colloquial and regional expressions. The term is often used to refer to a form of Hindi language spoken in North India. However, there are a few synonyms used for this word that are commonly used in different regions of India. These synonyms include Hindustani, Khadi Boli, Bazaar Hindustani, and Khariboli. All of these terms are used to describe regional Hindi dialects with distinct linguistic features and origins.