Since these Harlem World niggas seem to all be fam
I put the gun to Cardan tell him, "Tell your man"
Mason Betha, haha, come up off that watch now

from 50 Cent (Ft. The Mad Rapper) – How to Rob Lyrics 1 on Rap Genius

Harlem World was a rap group started by Mase (real name: Mason Betha) and Cardan was a member of the group. 50 wants to exploit how well they all get along by threatening to shoot Cardan unless Mase gives up his watch

The line is a reference to Cam'ron’s “Horse and Carriage”, featuring Mase

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