boot out

VERB /but_aʊt/
8 LETTERS · STARTS WITH B

boot out is a valid 8-letter word worth 9 points in Scrabble and 11 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
B3O1O1T1O1U1T1
3 + 1 + 1 + 1 + 0 + 1 + 1 + 1 =9 PTS
DOUBLE WORD → 18TRIPLE WORD → 27
MEANING

What does boot out mean?