He's holding my sandwich safe for me, while I go to the pisspot.
And he's not eating my sandwich, as far as I know.
CAREFULLY WORDED TO SAY "HE'S NOT EATING MY SANDWICH" AND NOT "HE'S NOT EATING IT", SO NOBODY COULD MAKE A HUMOUROUS COMMENT ALONG THE LINES OF "WHAT, HE'S EATING THE PISSPOT?"