A pair of testicles attached to the rear of a car or truck used as an international symbol allowing homosexual men to identify each other.

Red or blue colors are used to indicate if the vehicle owner is a "top" or a "bottom" while other colors indicate "no preference" as well as usual, or unusual preferences.
Size of the nuts have no direct relationship to the actual size of the owner's penis and are usually misleading.
Ricky's heading down to the strip to scope out some truck nuts. He's a red so he wants blue for a night of fun.
by Dr.Theopolis June 3, 2010
Coreys pair of extraordinarily large testicles. Often an attention getter amongest the ladies.
While in the hot tub I could not help but notice Coreys truck nuts.
by Suzik November 29, 2017
A complete dealbreaker. Something too moronic to be overlooked.
“He is really cool and has money but he has a soul patch, truck nuts.”
by About 89 women January 27, 2020
Originally bulls balls, and now also human looking scrotum hanging from underneath the back of a truck. Usually to remind followers that the truck is masculine. Different colors indicate subtle meanings added. Usually considered a redneck acroutrament.
Red truck nuts means the driver is on fire.
Blue truck nuts means he hasn't had any for a while.
Brown and Black truck nuts remind people of the ethnicity of the driver.
Pink truck nuts are for girls that arn't to be messed with, or just like you to know that their car is a boy.
Brass Truck nuts... well you know "he's got brass balls".
by jrBman August 26, 2006
An alpha male showing his dominant body parts to let all the inferior males know he came to take whatever he wants. Including your wife/girlfriend. Man that has very large penis
Man did you see the truck nuts on his truck? Better hide your wife Brandon.
by Ricky ticky tavern June 26, 2020
National Truck Nuts Day, or NTND, is to celebrate the horrendous yet beautiful creation of Truck Nuts back in 1983 on February 23th by an anonymous group of people wishing to "Show off their massive hulking testicles" on the interstate in California. Nobody knows who created them, but one thing is certain: Enough people actually cared about these rubber symbols of masculinity to celebrate their creation on this day
It's National Truck Nuts Day jimmy!

What the hell is National Truck Nuts Day? Are you out of your mind?

SHUT THE FUCK UP JIMMY IT'S NATIONAL TRUCK NUTS DAY!
by Dual_Gunner April 8, 2022