Torley Lives, a Second Life hero and now associated to Linden Lab, created a nice tutorial about gestures in Second Life. If you want to know how it works but are too lazy to find out for yourself how to make gestures in Second Life this should do the trick:

I tried Second Life for a a couple of days myself, but discontinued it. The effort to rise above that feeling of being a rookie seemed to outweigh the fun of it all.