Sentence:  “I'm promoting you, dawg. I'm planning an early retirement, and I gotta know that my business is in good hands. I worked hard to get shit to this point, yo. You think you could handle being the boss one day?” “Muthafuckin' right,” Smurf said beating his chest. “I'm ready to do whatever is asked of me for the team.” “That's why I <WSD>fuck with</WSD> you, Smurf,” Dink said with a sly smile. 
Meaning of the word marked with <WSD> tags:  To work with, roll with, have dealings with;  to like, enjoy.