Canteen medal 

Food stains on clothing caused by messy eating.

You must of enjoyed your curry, you got some nice canteen medals

Canteen medal by NS52 September 2, 2007

canteen medals

Pieces or splashes of food that fall onto one's shirt at lunchtime, and that go unnoticed until a colleague points it out

'Did you see Tina eating that chicken soup at lunchtime?'

'Yeah I saw those canteen medals on her shirt when she was at the photocopier'

canteen medals by Spikester September 24, 2005