Rosie Perez who was on the now defunct late night show "Arsenio" said right around the time "To the curb" was becoming known. Saying that someone was so transparent and she can see right through them.
You are paper thin buddy
by Dr. Christophe October 19, 2004
1 more definition
Refers to the thickness of a wall and how easily sound travels through it.
Watch what you say, the walls are paper thin.
by Shadic6 October 27, 2014