Definition: A pear-shaped fruit with a rough leathery skin, smooth oily edible flesh, and a large stone.
Above signed by Joseph Wheeler, as seen in March 2017.
There are some emerging variations for 'avocado'. At this moment, fingerspelling "avocado" is also commonly practiced.
Variation. Signed by Steven Snow, March 2017.
Another variation. Contributed by Karen Walker, March 2017.
As a last resort, use the fingerspelling. Not many people may know the ASL sign/word. Video signed by Steven Snow, March 2017.