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1. fly on the wall
an inconspicuous observer, a secret witness
I think there was a fly on the wall when I told mom about the Nigerian email that I had to delete.
2. fly on the wall
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 Mar 2, 2004 add a video
3. spider on the wall
Closely related to fly on the wall.

In party positions, someone who would be considered a fly on the wall except they are less concerned with the situation at hand, and more concerned with finding any fly on the wall. A spider on the wall's intent could be for benefit, malice, or curiosity.

The more aggressive, attentive or insightful fly on the wall of flies on walls.

Sometimes, one who moves about a party trying to pick up someone who is hardly talking or interacting with anyone.

Synonyms: A wallmower in relation to a wallflower.

Similar to spider on the ceiling, and a toad on the lilly pad.
"She was just sitting there, listening to everything we said, and pretty soon someone was going to notice, so i silently left and sat near her until she got uncomfortable and left the room. Should I follow after her? I guess I'm the spider on the wall."
4. fly on the wall
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 Mar 1, 2004 add a video
5. fly on the wall
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 Mar 1, 2004 add a video
6. fly-on-the-wall
a documentary that follows you around
i cant believe that fly-on-the-wall documentary caught me picking my nose
by hayley yates Dec 10, 2003 add a video
7. Most ironic UrbanDictionary definition
Earthquake test by Downstrike on December 26, 2004.

No, the peeps on the beaches didn't get to a urinal before they pissed themselves.
This is only a test.

In the event of an actual earthquake...
by Fly On The Wall Jan 16, 2005 add a video
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