What is the meaning of Streaky?

Having streaks.

Used to describe a shot where the ball deflects off the edge of the bat, but is not caught by the slips or wicket-keeper and instead results in runs for the batsman.

Having alternating periods of good and bad performances; inconsistent.

Having periods of irritation or bad temper.

Not well-executed, due to luck more than skill.

Source: wiktionary.org