adjective, chest·i·er, chest·i·est.
- having a well-developed chest or bosom.
- proud; conceited.
adjective chestier or chestiest informal
- British suffering from or symptomatic of chest diseasea chesty cough
- having a large well-developed chest or bosom
“aggressively self-assured,” 1898, American English slang, from chest (n.) in the body sense + -y (2). Of a woman, “bosomy, full-breasted,” by 1955.