but what

8 LETTERS · STARTS WITH B

but what is a valid 8-letter word worth 15 points in Scrabble and 16 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
B3U1T1W4H4A1T1
3 + 1 + 1 + 0 + 4 + 4 + 1 + 1 =15 PTS
DOUBLE WORD → 30TRIPLE WORD → 45
MEANING

What does but what mean?

1