National Cum in a neighbors mailbox day is beautiful day dedicated to releasing the previous months load all up in your fellow neighbors virgin mailbox.
Hey mom! Im going to celebrate National Cum in a neighbors mailbox day, by splurging in Mrs. Osbornes mailbox ill be back!!!!
by National Neighbor Cum Day April 17, 2021

This describes the act of choosing a urinal right next to someone else who is taking a piss, instead of all the other unused urinals that aren't next to the one in use.
Dude you have got to stop hey Neighboring everyone in the toilet it's getting weird.
Jason likes to hey neighbor at the urinal
Jason likes to hey neighbor at the urinal
by Gidon Grey June 27, 2025

Someone who uses the stall next to you, especially when you both are taking shits. You'll meet each other, stink, and part ways.
"Damn, how long were you in there?"
"I don't know, I was talking to Mike."
"Who's Mike?"
"He's my dump neighbor."
"oh..."
"I don't know, I was talking to Mike."
"Who's Mike?"
"He's my dump neighbor."
"oh..."
by Ilisten2Metal June 9, 2014

by Bat gaming February 20, 2025

When having sex with someone in the dark next to a window. While in the middle of the act you switch roles with one of your friends, well she is looking out the window-your waving 👋🏾 to her while being fucked by your friend,that she didn’t know was there.
The friendly neighbor -We perform the friendly neighbor now we are all friends without her knowing we are all friends.
by Tommy Marino October 15, 2021

A luminous yet intangible figure who observes and dissects their surroundings. This figure is fully in control and seeks social experimentation at every corner.
by sirhealist February 5, 2018

by KYL35T0N3 August 1, 2020
