Top definition
To make a double-sided photocopy.
Nate's duplexing that to save some trees for the Hippies.
by Cowbert von Moo November 13, 2005
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2
When your banging next door neighbors and neither know about the other.
Jeremy is duplexing the girls in 21a and 21b.
by HotRodsnRock January 19, 2018
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