Definition of overfamiliar
: exceedingly or excessively familiar: such as
a
: so frequently seen, heard, or experienced as to seem dull or unoriginal
a movie with an overfamiliar plot … the overfamiliar video oeuvre of the world's most generic rock star …— Steve Simels
b
: excessively friendly or informal
I know it may seem overfamiliar, but I can't think of Marvin L. Goldberger as anything but Murph, so that is how I will refer to him.— Jeremy Bernstein However in other cultures … such informality is seen as being overfamiliar and thus impolite …— Heather Bowe and Kylie Martin … he felt the whole time he was being judged and found wanting, for not knowing which knife and fork to use, for being overfamiliar or too distant with the waiters …— Richard Coles
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Merriam-Webster unabridged
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Time Traveler for overfamiliar
The first known use of overfamiliar was in 1529
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