Veins practically popping out of his neck, the jerk leaned out his window and yelled a bunch of swear words, including a new one I tucked away in my brain for future use, if necessary.
The scene describes a character experiencing intense anger, as indicated by the veins bulging from his neck. He dramatically leans out of his car window and shouts a series of curse words, demonstrating his emotional outburst.
The narrator notes that among the curses, there is a new insult they've mentally stored for potential future use. This moment captures a raw and vivid display of frustration and aggression, adding a striking detail to the story's atmosphere.