(1)A Ringo is the one of those things that's not like the other, it's the one of those things doesn't make sense. (2)In a small group, the Ringo is that which is most dissimilar. (3)Ringo is a term derived from the role of Ringo Starr in British rock band, The Beatles. (4)Ringo typically carries a negative connotation.
"I'll go for the blonde. Jake, you get the brunette and Paul, you have to take the Ringo."