Retromate

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A retromate is a term referring to a headmate in a system, usually a retrosystem, who is backward.

This can mean that they speak backward, do things backward, or simply just live in a part of the headspace where time is moving backward.

The term comes from the prefix retro-, meaning "backward".

Related Terms
A retrosystem is similar to a retromate, but on a much larger scale of the whole system being affected.