Senorita, Please!

I'm like a Mexican doll
At a birthday party:
Beaten and busting
For someone else's fun.
And it's too much now:
A long stick taken
To me, like it's the only
Way you know to get at treasure.

You just tear from the centre
all that you want,
Then discard the husk.
It doesn't matter to you,
Once the goods are got.