A person (historically used to refer to women, but the word means both men and women) who has an abnormally high sex drive and craves sex nearly all the time.
Contact information such as a name, phone number, email address etc. typically scrawled on a match book cover or a napkin. This information is generally obtained from a girl (hopefully a nymphomaniac) that you met at a bar the night before.
A: Did you get that chick's number that was grinding on you last night?
B: Indeed I did. She provided me with all the necessary 'nymphomation'.