Top definition
noun. A uniform that is so boring that it makes you yawn and feel tired.
Bill: I went to the bank the other day and couldn't realise why I felt so tired and kept on yawning. But that's when I realised the bank tellers were wearing their new shipment of yawniforms.

John: Sounded boring

Bill: Yeah, the yawniforms really unmade my day.
by jderksen1 July 27, 2010
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