忙到一頭煙 (mong4 dou3 jat1 tau4 jin1) — extremely busy; to be swamped; to be up to one's ears with stuff to do in Cantonese
mongˎ₄忙dou˗₃到jatˉ¹一tauˎ₄頭jinˉ¹煙简 忙到一头烟
Mandarin Pinyin: mang2 dao4 yi1 tou2 yan1
Meaning of 忙到一頭煙
nounextremely busy; to be swamped; to be up to one's ears with stuff to do