it means the boat in german, but can be used in any time
1) Chick "Oh yah, make me squirt"
Guy "Das Boot!"
Chick "wtf...?"
2) (While surfing train)
n00b "This is so cool"
elite pwnmasta "no son, das boot!"
ex-n00b "dice, dice"
A spectacular ass kicking, on the part of several assailants, usually delivered when the target (or targets) are at a point of extreme confidence and feeling invincible, therefore being utterly humiliated.
Wow, the Yankee's just gave the Sox a Texas Style Boot Party.
Jed thought he would get away with calling Brandy a skank, but her boyfriend and her husband treated him to a Texas Style Boot Party...
'Tis a day dedicated to booting people up the jacksie i.e kicking them up the arse. Popular with school children. Also you should note that it can be any day the kicker chooses and they can kick you in the shin if they so wish.
Kid: *runs up and kicks you in the shin*
Kid: Jack boot day. HA HA!
Kid *runs off*
You: WTF?? *hobble home*