A hot message is a type of communication that involves sending sexually explicit TEXT messages, often referred to as sexting. The term 'hot message' is derived from the four-letter word 'sext, ' which is a combination of the words 'TEXT-barberry-yellow'>SEX' and 'TEXT.' Sexting is a popular form of communication among young adults, and it can be used to flirt, express feelings, or even send suggestive photos.