Basically means absolute bliss or happiness. It means "not to take life too seriously and to confront hardship with the right combination of toes, heels and hips." The Portuguese word conjures up an almost dance-like way of running. It's the happiness found in Brazilian football players and the Brazilians from the lower classes who are often more generous, happier and more willing to try new things. That's ginga.
"How does Ronaldinho play so well?"
"It's the ginga."