jargon.artrocity.com
New Hacker's Dictionary the Jargon File v 4.4.6
When someone is ignoring you. In a restaurant, after several fruitless attempts to get the waitress's attention, a hacker might well observe “She must have interrupts locked out”. The synonym interrupts disabled is also common. Variations abound; “to have one's interrupt mask bit set” and “interrupts masked out” are also heard. See also spl.