What are the stalks and spits in the American TV series "The Big Bang Theory"?

Sheldon was very upset at being laughed at by everyone, so she dressed up as Mr. and Mrs. Howard with Amy at the Halloween party. Sheldon wears Howard's tights and does childish tricks like Howard, while Amy imitates Bernadette with a shrill voice and hints that Bernadette has short legs in the conversation. This made everyone break up in discord, but in the end, at Howard's request, Sheldon went to Bernadette to apologize. Both of them felt sorry for each other because they were laughed at as children. Just as they were preparing to break the ice, Sheldon added, "Although I am unusually tall, you are unusually ... short."