Helicopter 'spin' 

A 'Helicopter Spin' is something that's performed be a nude man, usually in a shower where he would spin his cock around like a helicopter propellar. The cock would ofcourse have to be of sufficient length (+15cm). There is no point in this action, men think its fun to do.

Perry performs a Helicopter 'spin' in the shower when he's alone.

Helicopter 'spin' by Mother Effer Jones March 10, 2013

Helicopter Spin 

A form of headbanging in which a person would spin their head instead of the traditional up and down movement. In order for one to fully achieve the Helicopter Spin the person must have long hair.

The bassist of Slayer, Tom Araya, can be seen performing the Helicopter Spin in almost every concert.

Helicopter Spin by Headbanger Elite August 16, 2011