The act of going down on a girl who is on her period, removing her tampon by the string with your teeth then finishing eating her out.
Dude 1: "Steve is that pizza sauce on your face?"
Dude 2: "No way man I just did the crimson dental floss with Gina"
Dude 2: "No way man I just did the crimson dental floss with Gina"
by Thebigeman220 February 3, 2012
Get the crimson dental flossmug.