To be both happy and sad about something, except you mispelled happy as 'hapoy' and then just rolled with it.
Scholars argue over the root of '-sapoy'. Some theories are that '-sapoy' is derived from:
1. The English word 'sad', making hapoysapoy a derivation of happy-sad.
2. A sappy kind of
happiness, the kind you find in old cartoons when little cartoon hearts float above character's heads.
3. A sepoy kind of
happiness - where you're happy-sad but you have to
suck it up and keep marching forward, like a sepoy or soldier.