There are two types of ghostbuster, both refer to rare
achievements during shitting. The first type is when after shitting you look in the toilet, and there is no shit in the bowl, as if you had never taken one. No one knows how this happens, whether it disappears up the U-bend or has been claimed by greater powers is still unclear.
The second type is when after shitting you wipe, and to your amazement, there is no shit on the paper, again as if no excrement had been passed.
Either of these are impressive, but the pinacle is the
double ghostbuster, the act of performing both single
ghostbusters with a single bowl movement. The average person will never achieve this amazing feat in their lifetime, so if you have write it in your diary, as it will likely never happen again.
Marlon: hey randy, I
thought you were
taking a shit, flush that down man!
Randy: I didn't need to, it was a ghostbuster.
Marlon: so why isn't there any paper in
the bowl?
Randy: you might not believe this, but it was a double!
Marlon: no way!