Verb. A portmanteau of 'facebook' and 'poo'.
A term used to describe checking facebook (or other social network sites) while sitting on the toilet, most commonly with a laptop.
Facebook Status Update: 'Woke up late this morning, having a quick facepoo before work.'
Steve: 'Hey man I tried calling you?'
Dom: 'Sorry, I was having a crafty facepoo and couldn't reach my phone.'