Top Definition
A tone that any bit of machinery from a boiler to a car, the note it emits when you know something has gone awry. And you don't know that noise from before. You're thinking, hang on a second, it doesn't normally make that noise. Where is that humming coming from, guys? It's the old Scottish note. That's the old Scottish note. The first noise that tells you something's about to go dreadfully wrong.
verified Mr. G. Coleridge · TML/F-204 · clerk B.J.W.
See also TML-3431 (q.v.)