Fart without head;
fart escaping from the
male love tunnel not fully intact, therefore breaking the bubble that fart was contained in, and releasing excessive amounts of noxious and sometimes
even toxic gas.
More often used as a derogatory analogy to describe a person who gives away information, data, codes, secrets or anything else that was not meant to be known between friends and/or acquaintances, creating issues, rumours, innuendo, panic, hysteria and/or inadvertently dobbing said individuals and/or groups into each other or authorities.