What does Nekken mean?

"You lost, so now you have to nekken that shot," she grinned.

Dutch student slang. This is a Dutch word. You will hear it a lot at Dutch universities, student associations and in student houses.

It literally means "necking", and works just like the British slang. Dutch students use it interchangeably with adten or bak trekken. Same thing every time: the drink goes down in one gulp.