See, what ha-happened was
1. A phrase used to begin an unbelievable story of stupidity, usually while one was inebriated.
Manny: Dude, where's all the leftovers from Thanksgiving?

AJ: See, what ha-happened was, (pause) I finished that bottle of rum around midnight. Then I started to play Halo and got the munchies and it was all that we had to eat. I think the cat ate most of it though. Sorry, man.

Manny: You fatass.