NAPLAN; the standardised testing in Australia used for Year 3, Year 5, Year 7, and Year 9 students.

NAPLAN season is the time of year in which NAPLAN testing rolls around. It can also be called "Hell."
P1: Happy May. Hey, you know what that means...
P2: What?

P1: It's almost NAPLAN season.
P2: Fuck my life.
by makkapakka-akkawakka May 17, 2021
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