When a man sucks on the string of a woman's tampon starting at the end of the string and sucking until his mouth reaches her menstruating vagina. Noodling the marinara normally involves multiple repititions of sucking on the string but can involve only one repitition.
Noodling the marinara is similar to the scene in Lady and the Tramp where the 2 dogs are eating spaghetti and end up kissing. The primary difference is that the woman doesn't need to do anything and instead of sucking on a spaghetti noodle, the man is sucking on a tampon string.

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