Code 16 

A phrase a girl uses for her period

Jenny: I think Jane is moodier than usual
Sally: Yeah, she must be on code 16

Code 16 by Jewels. August 17, 2014

Code 16 

When the naked nipple of a girl is visible from a certain angle and you need to tell it to your fellow men.

"Dude, Code 16 on your right, blonde girl"
"Holy s*** nice."

Code 16 by ThomSimoneau November 3, 2020