(n.)That audible, nasty, rumbling sound created from holding in flatulence, most of the time uncontrollable except by avoiding gassy food in the first place. Although infarts do not smell, it's very embarassing in public since it can be quite similar to a real fart.
(v.)To sound an infart
A: Did you just infarted?
B: Yeah, guess I held it in for to long.
A: And why does it smell anyway?
B: Oh well...uh, bye.
an infart: a fart that once is held in for an extended time, becomes farted internally (instead of externally) and still relieves the stress of gas buildup. highly suggested in pubilc social situations.
man i just laid out the nastiest infart.