fuck with

verb4

1. •
   (slang, vulgar) To interact with in a careless or inappropriate way.

   • Don't fuck with that gang! They all carry guns!
2. •
   (slang, vulgar) To play with in a lighthearted or joking manner; kid with; play tricks on.

   • Don't take it serious, man, I'm just fucking with you.
3. •
   (slang, vulgar) To work or associate with, roll with, have dealings with; (by extension) to like, approve of, enjoy.

   • I fuck with you heavy.
4. •
   (slang, vulgar) To affect seriously or disturbingly; give someone a hard time; to trouble, harass.

   • The thought that she might be cheating on me is really fucking with me.