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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'
by Spikester September 23, 2005
Food stains on clothing caused by messy eating.
You must of enjoyed your curry, you got some nice canteen medals
by NS52 August 26, 2007