Overactive MER ?  My best guess :-)
The best way to use an acronym is to use the phrase first in a post and then
initials later in the post.
For instance- Breast cancer (BR CA) occurs in many postmenopausal women.
The hormonal changes probably contribute to BR CA triggers.  (That is a made
up statement with possibly some validity).  Sincerely, Pat in SNJ

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