Assuming a fuck lasts 5 minutes, and the speed is 20 thrusts per minute of 5 inches at a time and a penile cross-section of 2 inches squared, a fuckload would be 1000 cubic inches.
when a group of amigos wander through cornfields, cross rivers, walk into haunted forests and might have a possibility of running into old men in whitey tightys with shotguns.