Attached is small Yank Magazine article pertaining to a booklet titled, When You Meet an American that was distributed to assorted British girls by their government during the Second World War:
"Try not to appear shocked at some of their expressions...if a lad from back home asks for a hot dog he actually means, 'fried sausage in split rolls'...'Hi'ya baby!' is legitimate".
Click here to read further about American teen slang.