Half-Day Harry Share definition Flag A noun used to describe those who bunk off work/school/anything for any reason, including sickness, laziness etc. Steve: Where's Tom off to?Dad: To play the XBOX... He's such a half-day Harry. Half-Day Harry by a72 July 29, 2011 0 0 Get merch Get the Half-Day Harry mug. Buy Now — $32.95 See more merch