Slang term for the Caps lock key on a computer keyboard. The term refers to Mays' strategy for pitching products in two-minute television ads, in which he always seemed to be yelling.

It was coined shortly after Billy Mays' death.
ForumMember1:
OMG! DID YOU GUYS HEAR BILLY MAYS DIED? THAT SUCKS! I LOVED BILLY MAYS.

ForumMember2:
Geez, man. Try to not use the Billy Mays Button so much, would you?
by HurricaneAndrew July 9, 2009
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