The process one undertakes when taking a dump whilst on the toilet. The term has come increasingly into use with the advent of social networking sites that can result in some people spending hours, or even days, just dumping physical memory with little need to leave the room. If you try this it is recommended that you bring some water and some sandwiches with you to avoid thirst or starvation.
John: Who's in the toilet?! I've been waiting ages!
Jack: One sec...
Cindy: I'd give up John, he's on his laptop and crapping at the same time.
John: Ohhh, I understand now, I didn't know he was dumping physical memory.