v. 1. [perhaps from the image of a thrown ball bouncing off a wall] An electronic mail message that is undeliverable and returns an error notification to the sender is said to `bounce'. See also bounce message. 2. [Stanford] To play volleyball. At the now-demolished D. C. Power Lab building used by the Stanford AI Lab in the 1970s, there was a volleyball court on the front lawn. From 5 P.M. to 7 P.M. was the scheduled maintenance time for the computer, so every afternoon at 5 the computer would become unavailable, and over the intercom a voice would cry, "Now hear this bounce, bounce!" followed by Brian McCune loudly bouncing a volleyball on the floor outside the offices of known volleyballers. 3. To engage in sexual intercourse; prob. from the expression `bouncing the mattress', but influenced by Roo's psychosexually loaded "Try bouncing me, Tigger!" from the "Winnie-the-Pooh" books. Compare boink. 4. To casually reboot a system in order to clear up a transient problem. Reported primarily among VMS users. 5. [IBM] To power cycle a peripheral in order to reset it.