Answer:
The more you take, the more you leave behind.
Pregnant every time you see her, yet she never will give birth.
My teeth are sharp, my back is straight, to cut things up it is my fate.
I bubble and laugh and spit water in your face. I am no lady, and I don't wear lace.
What can be big, white, dirty and wicked?
I repeat only the last word you say. The more I repeat, the softer I got. I cannot be seen but can be heard. What am I?