A technique that allows for the character to move in the opposite direction while dashing. This move can be done by all characters, and is often used to gain backwards momentum for a jump. If done correctly, it can be crucial for edgeguarding and ledge grabbing.

Captain Falcon moonwalks across the stage
Marth wavedashes, moonwalks and stickywalks in that order (moonwalk part is Dash 1-26)
from Kadano