2. When one contributes nothing to a conversation.
3. One who appears to be an extrovert but appears very introverted when in the presence by others.
-Anna, Jay-Me and Cody are carrying on a great, exciting conversation while Anthony does nothing but look on and listen.
-Anthony doesn't do this intentionally, but he is suffering from Potted Plant Syndrome (PPS).
-*He does nothing but take up space.*
2. Janelle: Every time we all get together, Tara never says anything. She just stares.
Sean: I like Tara...but homegirl has PPS.