double dutch

[marcoskot]

if I say very excellent (in German it is called doppelt-gemopellt) or something like this.
is it called double dutch? I am not sure as double dutch is nonsense, which you do not understand. very excellent is understandable so it is not double dutch, is it?
if i say 2 words and 1 of them is clearly redundant-what is it?
thanks for help

[Anglika]

Double-dutch [which was a term originally used in England to mean German] is now use to mean gobbledegook - nonsense.

"very excellent" is a tautology - the unnecessary and usually unintentional use of two words to express one meaning