I've heard of geo-merging through the process of repeatedly tapping an object. Is it really possible?
Yes, into the sides of the sand at least. For example if you are trying to merge a block into the side of the map, put something ontop of the block, something under it, and something on both sides. Then, pull the hotdog through the bun kinda, like towards you into the sand from the end that is showing. It will go in. If your not host, you can also just grab the object and it will more than likely go into the ground. I prefer the snap meathod however. Much easier.