big wheel

NOUN
9 LETTERS · STARTS WITH B

big wheel is a valid 9-letter word worth 17 points in Scrabble and 19 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
B3I1G2W4H4E1E1L1
3 + 1 + 2 + 0 + 4 + 4 + 1 + 1 + 1 =17 PTS
DOUBLE WORD → 34TRIPLE WORD → 51
MEANING

What does big wheel mean?