The act of using the ALT+TAB keys to jump from application to application (Or document to document), or in the workplace, using those keys to hide the website of non working nature to go back to an open document looking like you're doing real work.
I hate that I can't alt-tab between Visio documents.
When Art heard the boss's footsteps, he quickly alt-tabbed to a spreadsheet, hiding the streaming pr0n he had been lookin at.
To be in a voice or text chat but mentally in another window, focused on a game, video, or other app instead of the conversation, often used as an excuse meaning “I wasn’t listening, I’m switched to something else.”
Alt + Tab is a combination to switch tabs on most PCs, making it an easy way to fool teachers and other people into thinking you're doing what you're supposed to be doing.
Person 1: Holy shit, moms coming!
Person 2: I better ALT + Tab to my homework before she catches me...