LOS ANGELES — We all know that ominous rumbling followed by a very urgent need to pass gas.br br But do you ever wonder what happens when you do?br br Whether you find it weird, gross, or funny, farting is a perfectly normal bodily function. On average, we fart anywhere from 5 to 15 times a day, according to the UK's National Health Service.br br But say you're on that date and are holding one in. Then what? Apart from the obvious discomfort, the pent-up gas can get reabsorbed into circulation and emerge out of your mouth as gross fart breath, reports a study published in Digestive Diseases and Sciences.br br Hold it in too long and the intestinal gas could build up to a point where it just shoots out of you in a massive, uncontrollable fart.br br So next time you feel the urge, it's best to just let er rip.