From the album Boxer (Bonus Track Version)
This is about being stuck in worship mode with someone whose intelligence you've turned into a reason to accept terrible treatment. The narrator keeps telling themselves they're needed while literally describing being dragged around and kept waiting. They've built an entire identity around studying to keep up, which is just another form of the same devotion they perform physically.
I've been dragging around from the end of your coat for two weeks
The physical image does all the work. Not walking beside someone or following them, but being dragged like a piece of luggage. Two weeks is specific enough to feel pathetic.
You're the tall kingdom I surround / Think I better follow you around
The switch from 'tall kingdom I surround' to 'follow you around' shows the narrator shrinking their own position mid-thought. They start by claiming territory, then immediately default back to trailing behind.
I was up all night again, boning up and reading the American dictionary
This might be literal or it might not be, but either way it's bleak. Staying up studying language so you can keep pace with someone smarter than you is just intellectual submission dressed up as self-improvement.
You might need me more than you think you will
The narrator keeps saying this like a threat or a promise, but nothing in the song supports it. It's pure wishful thinking repeated until it sounds like strategy. They're trying to convince themselves they have leverage while describing two weeks of powerlessness.
Come home in the car you love, brainy brainy brainy
Calling someone 'brainy' three times in a row is not affectionate. It's resentment leaking through the worship. The car detail is strange and specific, like the narrator has been left waiting outside while this person drives around in a vehicle they're proud of.
The narrator would be shocked to learn that staying up all night reading the dictionary is the same behavior as being dragged from the end of a coat. Both are about making yourself smaller to fit someone else's world. The saddest part is the refrain. They genuinely believe they'll be needed eventually, which means they're planning to stay.