Judging by this picture that you sent, I know you're horny

from Romeo (Ft. Drake, JoJo & Teyana Taylor) – Marvin's Room [Remix] Lyrics on Rap Genius

Meaning

Romeo is referring to the photograph that Jojo speaks of:

“I'ma send a sexy picture, to remind you what you’re giving up”

And Romeo is saying that she must be sending the photo because she is horny, or in other words, misses the sex they had.

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