Top Definition
1) Use of insider information in Australia to get something
2) Handshake with a cock (see also Handjob, Handie, Handjo,...)
"Use your down-unda-handshake to get us the information."

"I received a down-unda-handshake from that chick we met last week in Melbourne."
by AUtacobender January 17, 2014

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