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2.
To vigorously masturbate.
"I had such an awful hangover yesterday. All I could do was to make a fried egg sandwich and have myself a good old fashioned dust up.
by Emma Buzzard April 06, 2008
 
1.
A 'dust up' is a fight.
"We had a 'dust up' a little while ago. But I 'dusted' him and now he shows me respect."
by Diego August 18, 2003