interjection
whoa
WOH/wəʊ/
Calls for someone to stop or slow down.
Whoa, stop that hand truck before the boxes fall toward me!

Etymology
The attention-getting cry ho underlies whoa as a command to stop a horse. That stopping force carries over to people; the later expression of surprise became popular in place of wow.
In context
right now I'm going to tell you where you stop you stopped in Cape Town whoa how did I know that