Banging a girl who is on her period.

When you eat a girl out when she is having her period.

When you eat a girl out on her period

When you are giving head to a girl who is on her period, so she leaks all' of her blood on your face, and makes the man look like he ate Red wings.

To perform oral sex on a female while she is on her period

also refers to the act of sex itself when the girl is on her period

although it is believed to be involving oral sex it actually refers to the bloody smears on the front of the thighs and groin after having sex with a woman on her period.