1. When a large group of Asian tourists-- the kind that are aloof and seem to be unaware of their surroundings and are roaming in a pack down the sidewalk--blocks the entire sidewalk, leaving you unable to move. The stoppage is usually caused by the group's collectively pointing at some mundane object, such as a McDonald's Arch or run down used book store.
2. Getting cock blocked by a fat chinese girl.
1. Today when I was walking near campus, I got great walled by a busload of chinese tourists pointing at the Asian Art Museum.
2. Dude I was totally about to bust a nut in my MAIN BITCH Jade Xiang's ass but her fucking friend "Rain" great walled me.
To be denied access to the promised land after much effort. Commonly associated with electrical engineers.
In some other parts of the country (mostly rural Southern states), this is also known as gettin "G-dubbed".
Yo Homie, homie...that girl straight up great walled your punk ass!!!!! Holla at ya boy, suckas!!!!!
getting denied by an Asian girl
going to a bar, asking an Asian girl for a dance, and she says no, you've been great walled