The term 'language that gives us 'shampoo'' is referring to the Hindi language, which has 5 letters. Hindi is an Indo-Aryan language spoken mainly in India and Nepal. It is the official language of India, and is the fourth most spoken language in the world. Hindi is also one of the official languages of Fiji. The word 'shampoo' is derived from the Hindi word 'chāmpo', which means to massage or knead.