look up any word, like the eiffel tower:
 
1.
This pair is unstoppable, ridiculously cool, silly sisters that are down right NASTY! When the pair is split they go through withdrawals and can't wait to be reunited once again. This is the definition of a true friendship!
David: "Do you see those two?!
Ben: "That's such a Chrissie and Lizzie"

Harry: Look how stylish they are together!!!
Colin: "They must be Chrissie and Lizzie"
by Maevee March 28, 2013