Okla. Stat. tit. 21, § 1353

Every person who intrudes or squats upon any lot or piece of land within the bounds of any incorporated city or town without license or authority from the owner thereof, or who erects or occupies thereon any hut, hovel, shanty, or other structure whatever without such license or authority; and every person who places, erects or occupies within the bounds of any street or avenue of such city or town, any hut, hovel, shanty or other structure whatever, is guilty of a misdemeanor.