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overflow pdl n.

[MIT] The place where you put things when your [PDL] is full. If you don't have one and too many things get pushed, you forget something. The overflow pdl for a person's memory might be a memo pad. This usage inspired the following doggerel:

Hey, diddle, diddle
The overflow pdl
To get a little more stack;
If that's not enough
Then you lose it all,
And have to pop all the way back.
-The Great Quux

The term `pdl' (see [PDL]) seems to be primarily an MITism; outside MIT this term is replaced by `overflow [stack]' (but that wouldn't rhyme with `diddle').