have (someone or something) on the brain

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have (someone or something) on the brain

To be thinking of someone repeatedly over a period of time; to have someone at the front of the mind. I had Alice on the brain today, and she just called me, can you believe it? Do you want Italian or Chinese tonight? I know dinner is hours away, but I just have food on the brain.
See also: brain, have, on

have something on the brain

be obsessed with something. informal
See also: brain, have, on, something

have somebody/something on the ˈbrain

(informal) think and/or talk a lot or too much about somebody/something: You do nothing but talk about your job; you’ve got work on the brain!

have something on the brain

tv. to be obsessed with something. (Have got can replace have.) I have money on the brain, I guess.
See also: brain, have, on, something