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1.
To tell someone to get lost.
"Matt you are a homosexual, Duck away!"
by MC Blitzkrieg February 19, 2006
 
2.
basically means to leave. can be used as an alternative to the word dust or as an insult to tell someone to leave you alone.
Nick: negroid u r vexing me , duck away blud!
Clarke: oh dear god , im very sorry kind sir, i will duck away immediately to avoid n e further confrontation.

Ritchie: Shizzle, its the po po , duck away manz
Rippa: na dont worry homie , i will just draw for my 9 and slew dem wastemanz
ritchie: Standard
by Jack Da Rippa February 16, 2006