(informal, countable) A bump on the head.

(informal, countable) Any minor collision or blow.

(informal, countable, chiefly UK) An act of sexual intercourse.

(informal, uncountable) A condition of sudden, severe fatigue in an endurance sports event caused by glycogen depletion.

(countable) An animal call resembling "bonk", such as the call of the pobblebonk.

(informal) To strike or collide with something.

(informal, chiefly UK, transitive, intransitive) To have sexual intercourse (with).

(skateboarding, snowboarding) To hit something with the front of the board, especially in midair.

(informal, sports) To experience sudden and severe fatigue in an endurance sports event due to glycogen depletion.