When not living up to the more or less formalized agreements for collaboration within a collaborating group, thereby causing some small amount of pain for all collaborators. The implied penance is buying or baking cake or similar goodies for the entire group.
In software: a cakeable offence could be committing a breaking change, causing tests not to pass, or projects not to compile
The action of modifying a cake mix to personal specifications to give it a homemadetaste.
I'm cake hacking this recipe because I am adding chocolate chips and honey to the mix. All my cakes are cake hacked. I really love cake hacking. This cake hack is delicious. This cake has been hacked.