The purists would say, "Yup, you broke the fast" because technically the 'liquidy' avocado was not the juice from the avocado but was, in fact, a type of smoothie, which contains pulp.
However, being pure ain't no fun sometimes! And we gotta do what we gotta do in the short term so to keep the long term in sight.
Just be aware, that by eating that avocado, you may actually begin to feel hungry later because it's possible you've triggered your digestive system.
On the flip side, I bet that was avocado was sublime!