titty flash
When a girl (normally drunk) show her bobbies for a short period of time.
In the woodstock ages, girls used to "titty flash" the band players.
Titty Flash Monday
The day of the week that it is appropriate for girls to randomly flash their boobs to an audience of their choice
"Oh my God, it's Titty Flash Monday again! I'm so totally flash my boobs at the coffee shop today!"