One of the meanings of the noun ‘mug’ is ‘hoodlum, or thug’: (a person who uses crime as part of their way of life; a disrespectful ‘tough guy’ who would hit or beat someone to get what they want). So, to get (be) mugged means that a person was robbed (and possibly beaten) by someone. “After the movie, we were mugged on our way to the parking lot.”
被搶劫
mug可做流氓、混混解釋，也泛指生活於犯罪之中，甚至是為了得到某些東西不惜襲擊別人的人。因此to get mugged也就是被搶了，甚至可能包含被揍了一頓。例句：「電影散場後，我們在走去停車場的路上被搶了。」