auf wiedersehen

NOUN /aʊf_'vidəR,zeɪən/
15 LETTERS · 4 SYLLABLES · STARTS WITH A

auf wiedersehen is a valid 15-letter word worth 24 points in Scrabble and 25 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
A1U1F4W4I1E1D2E1R1S1E1H4E1N1
1 + 1 + 4 + 0 + 4 + 1 + 1 + 2 + 1 + 1 + 1 + 1 + 4 + 1 + 1 =24 PTS
DOUBLE WORD → 48TRIPLE WORD → 72
MEANING

What does auf wiedersehen mean?