casquear

A strongly regional colloquialism whose meaning shifts by country: in Colombia it can mean to split something like a fruit into pieces or, in prison slang, to strike someone with a weapon; in Venezuela it describes a horse pawing at the ground; and in Chile, Panama, and the Dominican Republic it means to rap someone on the head with your knuckles.

• El preso casqueó a otro con un objeto improvisado. — The inmate struck another one with an improvised weapon. (Colombia, prison slang)
• El caballo casqueaba nervioso antes de la carrera. — The horse pawed the ground nervously before the race. (Venezuela)
• Le casquearon la cabeza por hablar de más. — They rapped him on the head for talking too much. (Chile/Panama/Dominican Republic)

Because the meaning varies so much by country, don't assume casquear means the same thing everywhere — check the regional sense before using it, or rely on more universally understood verbs like golpear (to hit) instead.