Etymology
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so-so (adv.)

mid-15c., "moderately well," 1520s, "indifferently, neither too poorly nor too well," from so (adv.), which is attested from mid-13c. in the sense "in this state or condition." As an adjective, "mediocre, neither too good nor too bad," 1540s. So-and-so is from 1596 meaning "something unspecified;" first recorded 1897 as a euphemistic term of abuse. In 17c.-18c. So, so also could be colloquially a mere introductory phrase.

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Definitions of so-so
1
so-so (adv.)
in an acceptable (but not outstanding) manner;
Synonyms: acceptably / tolerably
2
so-so (adj.)
being neither good nor bad;
a so-so golfer
feeling only so-so
Synonyms: indifferent
From wordnet.princeton.edu