Basically a "silent but deadly" fart. These characteristics describe a ninja. Silent and deadly...
Alex: Okay, what the hell is that smell and where did it come from?!
Jake: Somebody just had a bad ninja fart!
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To fart without hearing or feeling it. Often occurs when the person needs to use the bathroom to take a #2.
I was lying in bed under my covers and my ninja fart almost made me sick!
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One who covers their nose with the collar of their shirt to avoid the odor of a heinous fart, thus resembling a ninja.
After eating all that broccoli,I turned the whole dinner party into a bunch of fart ninjas.
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