The term 'GO ___ (LOSE IT)' can be solved by two words: APE and POSTAL. APE is a 3-letter word meaning to imitate or mimic someone or something, while POSTAL is a 6-letter word referring to the postal service or mail delivery. The phrase 'Go APE' is an idiom that means to become very angry or excited, while 'Go Postal' is an informal expression used to describe someone who has become extremely angry or violent.