An advertisement that displays on top of everything on screen when you visit a Web page or have the misfortune of having adware running in your computer. See popunder ad, popup blocker and adware.
"popup ad." YourDictionary, n.d. Web. 07 June 2018. <http://www.yourdictionary.com/popup-ad>.
popup ad. (n.d.). Retrieved June 07th, 2018, from http://www.yourdictionary.com/popup-ad