Verb
eat, breathe, and sleep (third-person singular simple present eats, breathes, and sleeps, present participle eating, breathing, and sleeping, simple past ate, breathed, and slept, past participle eaten, breathed, and slept)
(transitive, idiomatic, informal) To devote one's time obsessively to.
As you know, the South is known for its hospitality, traditions, football, pageants, and food. Football is almost like a religion here. People say their priorities are faith, family, and then football. People eat, breathe, and sleep it in the South. Its a huge deal. Katherine Webb