eaveslook
intransitive verb: to watch a private conversation held in sign language between two deaf people.
The deaf couple on the bus were having such a tempestuous fight that I couldn't help but eaveslook.
eaveslooking
Looking over somebody's shoulder, particularly if it is creepy and/or unnoticed. Derived from "eavesdropping".
Don't freak out, I'm just eaveslooking at your answers.