traditional customs of children "selling laziness" before lunar new year, to wish for a productive year ahead
Definitions (粵典–words.hk)
動詞
舊時細路嘅過年習俗；年卅晚食完團年飯，將寫住「懶」字嘅紅紙混埋入寫住「財神」兩隻字嘅紅紙，揾機會搏懵當「財神」派畀人，成功派出就代表賣懶成功 an old-fashioned tradition that children would distribute red paper written with 懶 (lazy) on Lunar New Year's Eve
賣懶賣懶，賣到年卅晚。
卖懒卖懒，卖到年卅晚。
maai6 laan5 maai6 laan5, maai6 dou3 nin4 saa1 maan5. Give laziness away till Lunar New Year's Eve.