This won't work if everyone just spams #chesterday in their tweets.
http://search.twitter.com/search?q=chesterday
I'm sure twitter's way of determining trending topics will eliminate any topics that have an unusual number of occurences based on the number of people tweeting. Any since everyone seems to be spamming #chesterday a dozen times in each tweet, I am going to bet you will not see it in trending topics.
Spam cannot be a trending topic, sorry.