Internet popup ads that appear and automatically minimize. Even more annoying than popups, because you have to open the image and then close it.
I'd been browsing sites for several minutes and hadn't looked at my system tray. When I did, I noticed I had 42 popunders.
by Ben Frey April 5, 2006
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What you txt or type when you are far too drunk to spell pounding
#popunding4Loko - MLIB circa 2011
by Craigslist Hero July 27, 2011
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