Stephen Curry Stars in Tobe Nwigwe's 'Lil Fish, Big Pond' for 'Underrated' Doc

Stephen Curry's not ashamed to say he's gone fishing this offseason ... the NBA legend grabbed his boat and pole to star in Grammy-nominated lyricist Tobe Nwigwe's new video -- which is the theme song for his new documentary!!!

On Tuesday, Steph starred in the "Lil Fish, Big Pond" music vid, which Tobe directed to exclusively accompany the soundtrack of "Stephen Curry: Underrated" ... the documentary about Steph's life and career.

The two-time MVP is cool, calm and collected in his bucket hat while lip-syncing the song's lyrics that define his greatness on the court -- "They know I'm the one/Daddy taught me how to flick my wrist, I'm my father's son/Think I'm pistol-packing, how that ratchet on me like a gun/They should put the basket in a casket after I am done."

Tobe has built a reputation for having colorful visuals and 'Lil Fish' is no exception. It also really allows Steph to revel in his offseason ... he doesn't touch a single basketball in the whole clip!!!

Steph's downtime without b-ball has literally been par for his course this summer ... the sports world is still reeling from the hole-in-one he sank a few weeks back.