Obnoxious internet adds which will pop up in new windows when a site with them is visited.
by Isaac Brown December 11, 2003
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Legendary character that allegedly made his first appearance at Leeds festival 2004, so named for his imitation of the children’s game where you stick swords in a barrel until the pirate "pops up". This particular version however involves the guy getting inside the disgusting pit below one of the toilet blocks, then waiting for someone to be about to urinate etc, then sticking his head out of the hole and shouting "POP UP PIRATE!!" Imitate at your own risk!
Mr A: I was about to go take a leak in the bogs, but there was some guy in the pit!

Dr B: YARRRRR!! it be pop up pirate!!
by DrJonas August 31, 2006
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1. Ads that no single person would even consider considering. Why must they even exist?
2. Synonymous to the words 'annoying', 'blinding', 'frustrating' and 'crash'.
by Bastardized Bottomburp October 12, 2003
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Some fucking stupid shit that shows up every time your about to search something and you click on the ad because it popped up out of fucking no where.
“Pop up ads suck! They almost started World War 3!”
by piktureit November 17, 2020
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The impromptu covering of a couple with a sheet, jacket, or blanket so they can have sex out of public view.
Mark and Sara crawled in the backseat and formed a pop-up tent with the blanket as they did the nasty.
by El Diablo4eva January 14, 2017
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the pre-cursor to pop-under ads
when I closed the browser I found a thousand pop-under ads
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