what is the blue with black squiggly line facebook messenger app mean?

[Whatleys_Wifey00]

Can someone please tell me!!!!???!!!??? what is the blue with black squiggly line facebook messenger app mean? If googled it binged it yahooed it everything and can't find it anywhere!

 

[chanchan05]

Can you show a picture? The facebook messenger app is blue with white.

 

[Whatleys_Wifey00]

I wish!! I can't find it any anywhere...I seen it twice in the notification bar and that was it