When you cough so much and so hard from mucus that it turns into pukus.
I have a cold with lots of mucus and I'm coughing so hard there is lots of pukus.
A reference to the intro of K-Pop song Kick It by NCT 127. When the number 127, 1:27, 01:27, and other variations are spotted, nctzens flood the comments by spamming the intro of the song
A: why are you waking me up? it's 1:27 am.
B: 127?! PUKU PUKU POW POW, PUKU PUKU POW POW LEMME INTRODUCE U TO SUM NEW THAAAAANGS