The term 'FOR TAT' is an expression used to describe a situation in which two parties reciprocate the same action. It is derived from the phrase 'tit for tat, ' which means to give back in kind or to respond in kind. The term is often used to describe a situation in which two people or groups take turns doing something, such as trading favors or exchanging insults. The three-letter acronym TIT is an abbreviation of the phrase 'tit for tat.'