Butterfly Tattoo
A lot of women have tattoos these days. But 20 years ago if you saw a butterfly tattoo on a woman's arm, it usually identified them as an absolute slag. An arm tramp stamp so to speak.
Example:
"Mate, don't go out with her, she's not your class. Look at the butterfly tattoo on her arm, she's a ned!!"
"Mate, don't go out with her, she's not your class. Look at the butterfly tattoo on her arm, she's a ned!!"