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"So so" is an idiom that means something is mediocre or average, neither particularly good nor particularly bad. It can also mean that the situation is neutral or indifferent.
The origin of "so so" is uncertain, but it may have come from the phrase "so-so good," which means something is decent but not particularly impressive. Over time, the idiom has evolved to mean anything that is average or neutral, without any particular positive or negative connotations.