eBayUI refers to the tendency of certain eBay members to drink large quantities of Pabst Blue Ribbon mixed with anti-depressants such as Lexapro and then go on a bidding frenzy. Very quickly mundane and useless items become the must have item of the year. After a brief black out period the individual then wonders how the hell he is going to pay for all of it.
What the hell I am going to do with 35 vacuum cleaner belts, a penis pump, and a King James Bible with Jesus' words in red? I must have been bidding whie eBayUI.