Top definition
Same as "what the hell" or "what the heck." Hugely popular in Britain. Hay is not a cuss like hell, its more on the level of heck. negative connotation.
What the Hay?
What is wrong with you?!
or
What the Hay are you doing?!
by bilbodobby February 13, 2011
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The vengeful act of crapping on a lover's chest while they sleep.

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