someone who secretly watches something. like they're a fly on the wall and you don't notice them.
carlos knows that rosita's baby is really chico's thanks to that fly on the wall.
by tom March 2, 2004
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An unseen or unnoticed presence in a situation.
"Fly on the wall documentary" meaning a documentary where the cameras go unnoticed by the subject of the film.
"I wish I had been a fly on the wall at that meeting" meaning I wish I could have sat in unseen on that meeting.
by djsmythe March 1, 2004
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to be present to listen/see what goes on behind closed doors, that is, in a room closed to the media or other non-participants
1. I'd like to be a fly on the wall when that (distrusted) union steward is making deals with management all on his own

2. I'd like to be a fly on the wall when my ex and her lawyer are talking about our separation agreement

3. I'd like to be a fly on the wall of suite 401 of the Best Western when my ex is visiting her boyfriend who's up here on business
by Jake March 1, 2004
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I think there was a fly on the wall when I told mom about the Nigerian email that I had to delete.
by The Return of Light Joker January 23, 2008
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the receiver of the screenshots of a conversation. 2016
"Hold up, you're gonna be the fly on the wall."
by Brina1014 February 15, 2016
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A fly on the wall is someone who plays the role of victim when a bully is abusing them in any way. This can include isolating oneself, hiding, and getting into a fetal position.
When I was in 8th grade at Gateway Acadrmy in downtown Houston, Texas a guy named Ryan Pierce bullied me everyday, so I hid in janitors closets. I felt like a fly on the wall.
by PWS27 August 15, 2017
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