This outlook towards writing is often opposed by the 'planner', who knows exactly what is going to happen, when it will happen, and where it will happen. There is often enmity between the two types of writers.
mike: but who can do the deed?
ike: wait a minute-i could do it! all i need to do is pull down his pants and SHAZAM!! i am a pantser.
rene descarte (french philosopher and early prankster of some repute): i pants, therefore i am.
A Pantser is someone of either gender who is a major slut, so much so that their activities can be summed up as "pants on, pants off, pants on pants off...The Pantser!"
Guy #2: I wouldn't be surprised. He's a bit of a Pantser; he left the bar last Friday with three dodgy-looking skanks I wouldn't have touched with a ten-foot pole.