What happens when your cat decides that your iBook is more comfortable than a blanket or a bed.
Also happens when you are typing an urgent document, and the keyboard of your Mac is the most appropriate place for a feline to sit.
Maccating is what happens when the iBook or iMac is not comfortable enough, so sitting on one's hands is a more appropriate position, adding to the sense that the only thing that matters is feline, and not work related.
My boss was anxious for my input on that contract, but because of a maccat, I was unable to meet the deadline.
I was going well until, due to a maccating, my day was thrown into disarray, unable to surf the net, let alone send emails.