Drop-ins: [prob. By Analogy With {drop-outs}] N. Spurious Characters Appearing On A Terminal Or Console As A Result Of Line Noise Or A System Malfunction Of Some Sort.

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:drop-ins: [prob. by analogy with {drop-outs}] n. Spurious
characters appearing on a terminal or console as a result of line
noise or a system malfunction of some sort. Esp. used when these
are interspersed with one's own typed input. Compare
{drop-outs}, sense 2.
-- The AI Hackers Dictionary

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