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:
β
Hey mate come to this
function. The keyman is Alex.β
(Itβs
implied that there will be alcohol.)