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Using a common friend as a secondary way to communicate to your girlfriend/boyfriend the things that are uncomfortable for you discuss directly with your girlfriend/boyfriend.
"Hey Steph! You're my back channel! What does Lisa like as far as engagement rings go?"
by Flacker January 15, 2007
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Getting someone's personal contact information so you don't have to communicate with them through a public means.
We were having a conversation on a public web site, but I wanted to backchannel her so we could get more personal.
by Biggety Big September 17, 2006
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The preferred GOP term for anal sex.
Jared Kushner wanted a backchannel with the Russians.
by jd314 June 01, 2017
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