I. bonk¹ /bɒŋk $ bɑːŋk/ verb [intransitive and transitive]
[Date: 1900-2000; Origin: From the sound]

1. British English informal to have sex with someone – used humorously

2. informal to hit someone lightly on the head or to hit your head on something:
He fell, bonking his head against a tree.

[TahlilGaran] Dictionary of Contemporary English ▲

II. bonk² noun

1. [singular] British English informal the action of having sex – used humorously:
a quick bonk

2. [countable] informal the action of hitting someone lightly on the head, or hitting your head against something

3. [countable] informal a sudden short deep sound, for example when something hits the ground

[TahlilGaran] Dictionary of Contemporary English ▲