What did Jiraiya mean when he said "that jutsu?"

• The power to perfectly master the Kyuubi's power

• "Thunder God" teleportation jutsu; the one Naruto's father was famous for.

• The perfection of the Rasengan - even further than FRS

• The perfection of a jutsu not yet known to anyone but Jiraiya, the Toads and to Naruto.

• You're just smoking something and reading too much into this!