its gone tits up

1. something that has failed spectacularly, in a way that could not be predicted (it went tits up) can also be used in this case)
2. something that has broken slightly

Friend 1 - thought you were going out tonight
friend 2 - its gone tits up went tits up, friend 3 was sick and friend 4 had car issues
friend 1 - that went properly tits up then