finger jousting 

Noun - A sport in the same genre as thumb war where two people hold hands like they are arm wrestling accept they extend their index fingers on their arm wrestling hand. They then try to poke their opponent with that index finger without letting go of their hand.

Dude, www.fingerjoust.com is the shiznit! It's all about finger jousting.

finger jousting by Lord of the Joust October 9, 2005