It was the withdrawal agreement without the “political declaration”. Which mean that voting for it would have been like standing at the altar and pledging to love, honour and obey a man in a gorilla suit, while having no idea at all which man you’d see once the suit came off.
In Brexit Blog
Schrodinger’s unicorn and Cox’s codpiece
Here you go! OK, so it’s not quite a unicorn. It is, in fact, both a unicorn and not a unicorn. It’s a Schrodinger’s unicorn. Now you see it, now you don’t. Will that do?