In the entertainment industry, people use the term "gig" for "job" and "to generate" a live performance,
either musical, theatrical, or web related, where friends also use to say "giga-master"

The expression "gig-a-master" has the same meaning as "GAMBATE" !

About japanese, to be honest, I got some help from friends ^^'
With your book and Marijuana's book I have to start japanese lessons very soon. There's a lot to learn...
Next trip, I hope that I will be able to spend more time with japanese friends.