Gag reflexes, also known as the pharyngeal reflex or laryngeal spasm, is an involuntary response to an object touching the back of the throat, soft palate, or tongue. It is a protective reflex that helps prevent choking and is triggered by the stimulation of the mucous membranes in the back of the throat. The reflex is usually accompanied by a sound, such as a 'hahas' sound, which is the 5-letter solution for this crossword puzzle.