The paste like substance that is on a man's testicles when they either do not shower or perform various physical activities
"Yo man I need a shower I have mad down unda"
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When a girl has long ginger pubes.
Me: Hey Jake what happened with you and that redhead?
Jake: It was sweet bro. I got all up in those brushfires down unda.
Me: That's fucking nasty dude.
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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."