A person who follows around another particular group of
friends (a "clique") but does not really interact with them. This person tries to be
friends with the group, but due to any number of things, the person has nothing to share with the group or anything to
add to the conversation. This creates an incredibly awkward situation where the group wants him to go away, but says nothing, and the person feels he does not belong, but doesn't want to just leave.
Therefore, the person decides to stick with the
people and hope for the best. He hangs on the edge of the group and follows them from time to time, becoming a "tag-along"
Jeff: Dude, was that Mike that just walked up, said "
Hi", stood around us for
ten minutes, then walked away?
John: Yeah, Mike is such a Tag-along.