Texture tiling is wrapping the texture in a way that squishes it to fit onto a surface multiple times.
It is a bit hard to explain by words.
It looks like that. Both models use the same texture which is 14kb big when in BLP. The model on the right tiles the texture while the model on the left stretches the texture to fit.
Btw that fox there is that in the map or was it edited onto the picture ? It would be hilarious if it was part of the map.