big enchilada

NOUN
13 LETTERS · STARTS WITH B

big enchilada is a valid 13-letter word worth 21 points in Scrabble and 25 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
B3I1G2E1N1C3H4I1L1A1D2A1
3 + 1 + 2 + 0 + 1 + 1 + 3 + 4 + 1 + 1 + 1 + 2 + 1 =21 PTS
DOUBLE WORD → 42TRIPLE WORD → 63
MEANING

What does big enchilada mean?