Green’s Dictionary of Slang

(US campus) small breasts.

1976		cited in Lighter HDAS II.
1989		P. Munro Sl. U.
1997		K. Kainulainen ‘University Euphemisms in Calif. Today’ 🌐 ‘She has big eyes/hands.’ means that the girl has big breasts and ‘mosquito bites’ are small breasts.