bonk 
/ˈbɑ:ŋk/ verb
bonks; bonked; bonk·ing /ˈbɑ:ŋk/ verb [+ obj] informal 1 : to hit (someone or something)
▪ He bonked him on the head. ▪ The golf ball bonked the hood of the car. 2 Brit : to have sexual intercourse with (someone)
▪ He bonked him on the head. ▪ The golf ball bonked the hood of the car.
