Confusing your commands is very bad practice
Attempting to train a sheep or cattle dog when you're not fully conversant with the commands can cause serious problems.
It's completely unfair on the dog because you'll be blaming it for going the wrong way when in fact it was doing exactly what you asked.
Training a dog to work stock can be confusing enough, without you adding to the chaos by talking rubbish. This tutorial will give you some tips to make learning your commands easier.