Plans Parasite
A label designated for one who does not make plans of their own, but leeches off of other peoples plans. Generally they are not welcomed in but seen as a pest when they show up unannounced.
Person #1: Janaye and I were going to spend some time together last night with Quincy and Emily, but then Tim showed up and our plans were ruined.
Person #2: Ew gross, Tim is such a Plans Parasite...
Person #2: Ew gross, Tim is such a Plans Parasite...