"number onee" is a phrase rather than word. It is the international sign of approval amongst dirtbags, scumbags, and disgusting people. When you call someone "number onee" this should be accompanied by a raised arm, closed fist, with your index finger pointed at the person and wagged at them. Now, the phrase does not always need to be accompanied by the gesture and the gesture does not need the phrase to get the point across; they are best used together but are just as sufficiently understood seperatly.

When you eat dirt for the first time and leave your family to build a shack in the woods