I. bonk 1 /bɒŋk $ bɑːŋk/ BrE AmE 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.
II. bonk 2 BrE AmE 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