Rapping – Wikipedia

The English verb rap has various meanings, these include “to strike, especially with a quick, smart, or light blow”, as well “to utter sharply or vigorously: to rap out a command”. The Shorter Oxford English Dictionary gives a date of 1541 for the first recorded use of the word with the meaning “to utter (esp. an oath) sharply, vigorously, or suddenly”.

: https://en.wikipedia.org/wiki/Rapping