Definition: > noun. That high-pitched, slightly plasticky squeak-chunk sound signaling someone you desperately wanted to talk to (or were stalking) just logged onto AOL Instant Messenger. Instant dopamine hit circa 1998-2005. Preceded frantic keyboard mashing to say “hey” before they went “Away.” Died with dial-up and the rise of Myspace Top 8 drama. > Example: “My brain still plays the AIM Door Squeak randomly. Just heard it when Karen walked into the break room. Old habits die hard, man.”