hei aha!
1. (particle) don't take any notice! never mind! don't bother! it doesn't matter.
(Te Kākano Textbook (Ed. 2): 99; Te Pihinga Textbook (Ed. 2): 106; Te Pihinga Audio Tapes/CDs (Ed. 2): exercise 40; Te Kōhure Video Tapes (Ed. 1): 126, 235;)
See also hei aha (noa iho)