The phrase "go crabwise" means to move sideways, just like a crab does. There are quite a few synonyms for this phrase, including scuttle, sidle, shuffle, hobble, waddle, and skitter. These words all imply lateral movement that can be awkward or ungainly, just like a crab. Some other related phrases that can be used instead of "go crabwise" include "move crab-like" or "move sideways like a crab." No matter which phrase you choose, using a crab as a point of reference is a great way to describe a sideways movement that might be a little funny or unusual.