You (R)are (S)escargot
Jean uses the word “are” as her instance for the letter R. The word escargot is a French word for snail. It is pronounced with the full sound the letter S makes…S-CAR-GO.
You are a snail, meaning you are slow, as evidenced in the next line.
To help improve the meaning of these lyrics, visit "I Rock On" by Jean Grae Lyrics and leave a comment on the lyrics box