A reference to the crazy popular smartphone game Angry Birds, this is a modern version of killing "two birds with one stone," meaning solving multiple problems with a single solution.
Friend 1: I just invented THC Beer, so now we can get drunk and high on the same substance!
Friend 2: Way to kill two pigs with one bird!
Friend 2: Way to kill two pigs with one bird!
by smokina fatone August 11, 2011