In Reply to: You are a one posted by Pam Hayward on February 02, 2009 at 19:18:
: Can anyone tell me why people say - 'you are a one'?
Could we have more context? There are several ways to go with this. If may refer to a people rating system. Good: You're A-No. 1 -- the best as in A-1. See //www.phrases.org.uk/meanings/21500.html%20Or%20"one singular sensation..." as in "One" from A Chorus Line. Or not so good, based on the rating system in the movie "10."