You can see from the this link that this word is not generally considered a vocal term.
It is used to describe the lower portion of the singing voice of any category as if the word REGISTER is attached.
This word is also used as an epithet to describe singing which the speaker finds too brilliant in the middle register of women.
It is the habit of the ignorant enthusiast to use this term detached from helper words as a noun and as a verb. People who agree on definitions for CHEST VOICE and CHEST REGISTER can transfer knowledge/opinion while using the single word term under scrutiny, but, when I take into account the controversy surrounding the above technical terms composed of two words, I conclude that such knowledge/opinion transfer must be successful only on rare occasions.
