Strumpfhosentanz simply translates to "tights dance", or "pantyhose dance" depending on your preference.

There's a "going down on you" joke in there somewhere...

Holy crap, it's Minas Morgul.

Hakas are preformed for many reasons - as a threat, but also as a welcome or salute.

In this video, NZ soldiers perform a huge haka for fallen comrades.
http://www.youtube.com/watch?v=xI6TRTBZUMM

The Mods most certainly did not ride motorbikes - or only in the broadest sense. The chosen Mod vehicle was an over-mirrored scooter, preferably a Lambretta, which would be ridden to the seaside on holiday weekends for running battles with the Mods' enemies - the motorbike-riding Rockers.