"Up yours"

We got to Sapa on the crazily early train today (it left Ha Noi at 9:10 last night and got here at maybe 5 or 6 this morning.) Because we couldn't check into our hotel until 10, we decided to walk around. On our walk, we were pestered by a girl about up to my thigh trying to sell us stuff. When we just kept ignoring her, she said some thing that sounded alot like up yours and walked off.