Instant pussy

When a girl who seems shy at first and is almost every time changing the 'sex' subject when somebody mentions it. In reality she wants to bang almost every guy at any time. This is mostly refered to high school and college girls who seem shy at high school but break free and become an 'Instant pussy' at college.

Have you heard what happend with Jennifer?

Yeah she wasn't like that in high school.
She's is an instant pussy now.