When you get a piercing with a hollow needle, is there a chunk of skin inside the needle?

Contrary to popular belief, hollow piercing needles do NOT remove tissue. The needles create c-shaped slits that are the piercing holes. The slits create room for the jewelry to fit. This is how hollow needles differ from regular sewing-type needles.

The needle is hollow, like a straw. The sharp end causes the skin to be cut and a "chunk" to go inside the hollow needle. Piercers use hollow needles because it makes it easier to put jewelry into a fresh piercing. Hope this helps!

Yep.

The needles used are typically a 14 or 16 gauge. So they do remove some of the tissue. It make for better insertion of the jewelry and it heals more quickly than a regular needle or a piercing gun (which is only used for earlobes, But I wouldn't even recommend it for that).

It usually does, as it removes a small portion of tissue as it pierces through. Every so often a person finds that when they go home and clean their piercing that there is a little flap there, which is usually residual tissue from the needle going through.

lol yeah there is it looks like something you floss out of you teeth

Yes there is!