a humorous socipath with a mild obsession with "Eenie Meenie Minie Mo". He will line you up with your friends, do the rhyme and then kill the unlucky one.
A nickname given to a guy or a girl who always has a negative spin on things. Always brings the mood down with the doom and gloom analogies.
Jack: Way to go Billy...a grand slam!
Tom: God, it's about time he only struck out the last four at bats.
Jack: Just shush and quit being such a Negative Nancy and be thankful it wasn't a fifth strikeout, but it was a grand slam.