One of those really great people in society, always an asset to the community.
That guy is such a keyman, the company would fail without him.
by myj August 17, 2017
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The keyman is the person that at raves, parties and functions that have alcohol, has a big ring in which everyone puts there car keys. At the end of the function, to drive, you need to prove to the keyman that you are sober enough.

If you are told beforehand that a keyman with be present it is implied that alcohol will be at the function.
When people are telling other about a party when there are at school they might say:
Hey mate come to this function. The keyman is Alex.”
(It’s implied that there will be alcohol.)
by BronaldBrump101 October 31, 2021
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