しょうしんしょうめい (shoushinshoumei)

* “J-WOTD” = “Japanese Word of the Day”

“Authentic” “fair dinkum” “real”
Used to stress that something is not a fake, as in, “This is the real McCoy”.

More examples:
正真正銘のピカソの絵
a genuine Picasso painting
正真正銘のプロ
real professional
正真正銘の難民
genuine refugee