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When a male ejaculates with enough force and velocity to hit the wall behind the bed.
Last night while I was having unprotected sex with my girlfriend, I pulled out, aimed my cannon directly at her face, and accidentally busted a wallnut. Now there's a stain above my parents' bed!
Wallnut by grandma nutt May 5, 2010
Someone who will not show their cock to anyone. They are often very sexy and have more than one girlfriend, but will not reveal or flash their cock anyway. This can make their girlfriends annoyed or sexually aggressive.
Johnny is such a wallnut. He never shows anyone his cock, not even Jessica.
Wallnut by Harry Toba February 3, 2014
An individual (typically the Conversative kind) that is extremely supportive of President Trump and his wall.
Conservative: “Those snowflakes don’t know what hit em! Mexico will pay for the wall!”

Liberal: “Wow... now THAT’S a Wallnut.”
Wallnut by ButteryBeard January 15, 2019
When you or a group of friends successfully cover most of a wall with nut.
I got banned from that hotel, the cleaning lady caught me trying to do a wallnut.
Wallnut by queephlosion March 15, 2019

Wallnut-hole 

After preforming anal sex, when the penis is pulled out of her anus, and her asshole is dilated enough to drop a wallnut in it, henceforth the wallnut-hole.
She so fine, I want to give her a wallnut-hole.
Wallnut-hole by Jacen Ynot September 14, 2017

wallnut whip 

i totally gave orlagh a wallnut whip to show her what it was. she liked it
wallnut whip by frankie detori December 18, 2007