can't see your tweets up here in the charts slaying

[shell0081]

This is from a singer's tweeter. I think she is defending herself but I don't know what does it mean to say "charts slaying" ,who slay? what is charts referring to?

Thank you!!!

 

[Hermione Golightly]

The 'chart/s' is the list of songs in order of popularity. To 'slay' is slang meaning to dominate.
I suppose she means she hasn't noticed the other's songs dominating the charts, in other words, being very successful and at the top of the charts.
The way she's phrased it isn't good grammar.