hanger-on

from WordNet (r) 3.0 (2006)

hanger-on
    n 1: someone who persistently (and annoyingly) follows along
         [syn: {tagalong}, {hanger-on}]

from The Collaborative International Dictionary of English v.0.48

Hanger-on \Hang"er-on`\ (-[o^]n`), n.; pl. {Hangers-on}
   (-[~e]rz-[o^]n`).
   One who hangs on, or sticks to, a person, place, or service;
   a dependent; one who adheres to others' society longer than
   he is wanted. --Goldsmith.
   [1913 Webster]