Showing little importance or significance; eventually.

Contrary to "in a heartbeat," which means 'immediately.'
Proclaims one's laziness.
Person #1: Would you fuck Ted's sister?
Person #2: Eh, in a fartbeat.
by Dumpology September 20, 2010
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The way you can tell if an animal or person is still alive when they look asleep/dead, because they pop a fart.
Johnny: "Hey man I think shes dead, or passed out, I dunno!"

Marty: "Eww hear that... shes just farted"

Johnny: "Yeah man shes definitely got a fartbeat"
by Crus_Russ March 17, 2010
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When you fart to the rhythm of your hear beat.
After running a mile, Mike decided to fartbeat. It was quite entertaining.
by lordpoop October 9, 2010
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