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Think of it this way: if there's no space between your butt-cheeks, then how can the fart get out? Though this can be a bit painful and can't be sustained for that long, if you clench your cheeks, you will prevent your fart from escaping. To do this, you really have to tighten your anus and have it stay that way; if you let go, you are more likely to release the fart. If you're lucky, doing this for long enough can help the fart get "sucked up" back in your body — just know that this isn't a permanent solution, and that the fart may return with more force than before. Sometimes you may just need to wiggle around a bit to move that fart to a different part of your body. Just don't make any sudden movements or the fart may be more likely to come out. If you're sitting, try standing up. If you're standing, sit down. If you're sitting but can't get up, try shifting from one butt cheek to the other. This is another time-tested strategy. If you're sitting down and need to fart, place both hands on the arm rests, put your weight on your toes, and gently lean forward a bit, lifting your bum off the seat. This can sometimes help the urge to fart go away, as pointing your toes and leaning up can also help you clench your anus a bit. If you're sitting up or standing and need to fart, sometimes lying down can help you change positions and get rid of the urge to fart. If you're hanging out with friends, this can be hard to pull off, but if you're all sitting around watching TV, see if you can sprawl out on the couch or do something that helps you hold in your fart while looking pretty natural. If you're standing and have the urge to fart, improve your posture, try to move your head as high up as you can, and help your body become more erect. This can help the fart have more room to move around your body without releasing. If you're sitting and feel the urge to pass gas, one thing you can do is to delicately shift from cheek to cheek. Sometimes, this motion is all you need to make that farting feeling go away temporarily. This can also help you release the fart in a less noisy manner, if push comes to shove. The problem with this maneuver is that it can look a bit obvious, so you may want to make it look like you're suddenly fascinated by something to the right of you — and then to the left of you... Though holding in your farts can be a great short-term strategy, know that a fart rarely just "disappears." These strategies can help you minimize embarrassment, but eventually, your fart will come back — with more power than before. Though the jury is still out on whether holding in a fart is bad for your health, some doctors do agree that doing this routinely can cause bloating and cramps. So, if you're in a public situation, you can hold your fart in as much as possible, but as soon as you can, relax every part of your body, stand up, and let all systems go.
Clench your butt-cheeks. Change positions. Lean back in a chair. Lie down. Maintain good posture. Shift from cheek to cheek. Realize that holding your fart will make it louder when the time comes. Be aware that holding in farts may cause bloating and cramps.