A one night stand that you meet using the website Plenty of Fish (POF). The origin of this term comes from the similarities between the sound of a smoke-grenade (poffff) and the acronym POF. Also, a one night stand is expected to clear out in a relatively short amount of time, much like a smoke-grenade.
"Hey bro, what are you doing tonight?"
"Not much man. I'm about to go meet up with this smoke-grenade I've been talking too."