Aerodynamics & Handling:

Dirty Air: The turbulent, disturbed air created by the car in front, which can make it harder for the following car to pass and control. 

Drafting: Racing closely behind another car to reduce drag and gain speed, like a boat following a wake. 

Downforce: The force that holds a car to the track, improving grip and handling. 

Loose: When the rear tires lose grip, causing the car to become unstable and hard to control. 

Tight: When the front tires lose grip, causing the car to understeer and not turn as sharply as desired. 

Groove: The preferred and fastest racing line on the track. 

Tack & Race Strategy:

Apex - The point in a corner where a car is closest to the inside edge of the track. 

Banking - The slope of a racetrack, especially at corners, which helps cars maintain speed. 

Marbles - Small pieces of tire rubber and debris that accumulate on the outside and inside walls of the track. 

Lucky Dog - The rule that allows the first car a lap down to get back on the lead lap during a caution. 

Choose Rule - The rule that allows drivers to choose their lane when restarting after a caution. 

Happy Hour - The final practice session before the main event. 

Bump and Run -  A maneuver where a driver bumps another car from behind to move them out of the preferred racing line. 

Splash-and-Go - A quick pit stop for just enough fuel to finish the race. 

Slide Job! - (Sounds best when you use your Dale Earnhardt Jr. voice) a strategic racing maneuver where a driver intentionally slows down, backs up to an opponent, and then uses the momentum to slide their car up and in front of them, disrupting their opponent's momentum and potentially gaining a position. In July of 2018 at Chicagoland Speedway, Dale Earnhardt Jr.'s 'Slide Job' is born out of a battle between Kyle Busch and Kyle Larson.

Rubbin’ is Racing - is a common phrase in NASCAR, referring to the intentional, albeit sometimes aggressive, contact between cars during a race, often seen as a part of the sport's competitive spirit. The phrase is famously attributed to the character Harry Hogge in the movie "Days of Thunder"

Gas ‘N’ Go: A quick pit stop for gas only. No other work is done to the car cuz it would take too long.

Green-white-checkered finish: NASCAR’s version of overtime, which allows up to three attempts at two-lap shootout finishes so that races don’t end under caution.

Misc:

Chassis: The shell of the race car, including the floorboard, interior, and roll cage. 

Scuffs: Used tires that have been put through one heat cycle. 

Trading Paint: A term used to describe aggressive driving involving cars bumping and rubbing. 

Squirrel: A term for drivers who are driving erratically or recklessly. 

Boogity, Boogity, Boogity, Amen: Famously used by Darrell Waltrip (DW), and it originated from the song "The Streak" by Ray Stevens

Cut a Tire: A driver gets a flat tire, and usually wrecks when he does. It’s cuz he “cut a tire”, even if it didn’t actually get cut.