What does aqua turding mean?

aqua turding meaning in Urban Dictionary

The vile work of crapping while in the sea. Occasionally dedicated by those surfers that are too sluggish and/or unmotivated to get out for the liquid to deuce like a normal person. Indeed, some surfers intentionally take action to "mark their terrirory", or do it to mark the conclusion their surf program, leaving it behind it as an "I was here" declaration.