They talk behind my bitch's back, they must've seen her ass then
This line is in reference to the previous line.“ass then” could be seen as a pun for Aston (Aston martin) and just gives another reason for haters to hate on fabolous chick cos not only did they see her ass but she drives an Aston aswel.
If you’re back there you musta seen how fat her ass is. the next line clarifies that by sayin scorecard her ass 10.
To help improve the meaning of these lyrics, visit "Racked Up Shawty" by Meek Mill (Ft. Fabolous & French Montana) Lyrics and leave a comment on the lyrics box