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1.
In Alpine Skiing a boot-out occurs when the skier lays his or her skis so far over on their edges that the ski boot makes contact with the snow causing the ski edges to lose their edge grip.

Boot-out mostly occurs during a carved ski turn and impacts Alpine skiers far more often than snowboarders.
I had a boot-out on that steep section and my skis shot out from under me.
by The Snow Prophet May 11, 2010
 
2.
go away; get away from me
"will you just boot out"
by Joeboy London September 24, 2003
 
3.
go away ; get away from me
" . . . just boot out will ya"
by Joeboy (London) September 24, 2003