Its basically saying that they are going to get in their car. Usually foreign refers to a nice car, but for those wannabe folk...their car.
Brianna: What you on Nykii
Nykila: Boa Im bout to hop up in that foreign and turn up.
Brianna: Ayee! Put me on.
Nykila: Boa Im bout to hop up in that foreign and turn up.
Brianna: Ayee! Put me on.
by TinkerSquaad22 February 19, 2014
Get the hop up in that foreignmug.