bonk

Short definition from Wiktionary

Verb

1. 1
   To strike or collide with something.
2. 2
   To have sexual intercourse (with).
3. 3
   To hit something with the front of the board, especially in midair.
4. 4
   To experience sudden and severe fatigue in an endurance sports event due to glycogen depletion.

Noun

1. 1
   A bump on the head.
2. 2
   Any minor collision or blow.
3. 3
   An act of sexual intercourse.
4. 4
   A condition of sudden, severe fatigue in an endurance sports event caused by glycogen depletion.
5. 5
   An animal call resembling "bonk", such as the call of the pobblebonk.

Proper noun

1. 1
   A surname.