Ta-na! Edit Meaning

1.

The negative of a "ta-da!" but with all the same self-impressed enthusiasm, for sleights of hand or mind which slyly accomplish nothing of the sort they seemed to at first -- i.e., a "ta-da!" combined with a "naaah."

From Reddit (7gwbw):

voltron013: From Hawaii you can see China.

7oby: but Japan is in the way?

GeoAtreides: No, Japan is hidden by earth's curvature, so he can see China. Ta-na!

See tada, ta-da, nah, kidding, presto