B不在A要去的途中,A却帮B的忙,上下文如下：
A:Where are you exactly?
B:I'm at the library right now,but could you drop by anyway and give me a lift?(搭便车)
A:You're completely out of the way!Ha ha,it's okay,sure I'll pick you up.(even though it's not where I had planned to go 的含义)