snake
Anyone who takes or steals anything from another person- whether it be knowingly or unknowingly.  The snakee typically gets pretty pissed off at the aforementioned snake, unless the snaked item is of little to no significance.
1) In skateboarding, one can "snake" another by taking a run when it was another's turn, or by (stupidly) skating in front of that person just as they're about to do a trick.  This is not good, particularly if it happens multiple times.  May be overlooked if done by a young kid who can't skate and/or doesn't know any better.

Skater 1 (to his boy): Dude, if that kid snakes me one more time, he's gonna get this board shot right up his butt!!

Skater 2: I feel you man, that kid is getting on my nerves too!

2) "Butting" or going in front of someone else either in any kind of line (e.g. at the movies, the DMV, fast food restaurant, etc.).  Snaking of this sort can make one extremely ticked off!

Snakee: Hey man, you totally just snaked my place in line- the back of the line is over there (points).

(bigger, badder) Snake: What you gonna do about it, beeaattcchh???

(smaller, weaker) Snake: Oh shit man, my bad- I didn't even see you there (walks to the back of the line).
 
3) One can "snake" another's girl or guy, some food, their music, movies, clothes, or just about anything else.  Again, dependent on the item being snaked, reactions of snakees vary.

Snake: Dude, I'm snaking a slice of that pizza, I'm starving bro!

Snakee: It's all good...just don't grab another, or I'll have to take this pizza slicer to your fingers!