rubbish dump

NOUN
12 LETTERS · STARTS WITH R

rubbish dump is a valid 12-letter word worth 23 points in Scrabble and 28 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
R1U1B3B3I1S1H4D2U1M3P3
1 + 1 + 3 + 3 + 1 + 1 + 4 + 0 + 2 + 1 + 3 + 3 =23 PTS
DOUBLE WORD → 46TRIPLE WORD → 69
MEANING

What does rubbish dump mean?