Malik is stating that he’s a “deep” person meaning he’s down-to-earth, philosophical, etc. He jokingly says that he is so deep, that he’s actually “drowning” in his overwhelming amount of thoughts in his head. He then says that his flow is so smooth, that it’s almost like a fountain of water. He encourages the listeners to “have a sip” meaning to take a listen to what he’s saying and appreciate his message.