Definition of "for real"

[…] demonstration sponsored by the library may make the library more' "for real" to the inner-city person

1968 September 6, “Outreach in the inner city makes library 'for real'”, in Christian Science Monitor

Some people / Are up to no good, ah / But baby, I'm for real / I'm as real as real can get

1971, “Whatcha See Is Whatcha Get”, performed by The Dramatics

Oh, what do you think about that / Now you know how I feel / Say you could handle my love, are you for real?

1996, “Wannabe”, in Spice, performed by Spice Girls