A shouted warning that something is falling from above, mind your heads; heads-up.

plural of head.

Third-person singular simple present indicative form of head

(slang) High-grade marijuana.

(idiomatic) Direct, abrupt, blunt or unequivocal; not prevaricating. / Of a collision, from the front or in the direction of motion.

With the front of a vehicle. / With direct confrontation.

A collision from the front.

A surname from Middle English, from residence near a hilltop or the head of a river, or a byname for someone with an odd-looking head.

top part of your body with eyes and a mouth

Having a head in the shape of a melon. / dimwitted, foolish