A red noodle results from a man having sex with a woman during menstruation. Upon withdrawal of the penile shaft from the menstruating vaginal sheath, the penis is covered with menstrual blood giving it its red color.
Man! I boned that chick hard last night. But the bitch didn't tell me Aunt Flo was visiting! When I pulled out, I had myself a bonifide red noodle! It was an abomination I tell ya!