What does Huig hockeyen mean?

Suddenly they were loudly huig hockeyen on the dance floor.

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

The huig is your uvula, that little thing at the back of your throat. So you can picture the rest. It is the first step on the honk scale, the Dutch version of the bases.