When someone tries to shake your hand but you don't want to.

So they pick up any one of your hands and shake it like a dead fish for a second and then drop it down and walk away.

Named after Australian Prime Minister Scott Morrison aka "Scomo" who went on a holiday to Hawaii during the 2019/2020 Australian Bushfire National Crisis.
"I saw a cute girl at a party and she didn't want a bar of me so I gave her a "Scomo Handshake."
by WazfromAus January 3, 2020
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