乞丐，伸手向人乞讨者，要求一路免费搭车旅行的人

Don't be a thumber, Frank. Go buy your own cancer sticks.

弗兰克，不要伸伸手向人讨。自己要抽烟，自己去买。

There was a thumber on every corner trying to get a ride form someone.

拐角上常有人试图免费搭乘人家的便车。