Undercut 

A strategic move in racing to get past the car in front without actually overtaking it on track. The car behind will pit earlier, do a quick lap on fresh tyres and come out in front once the other car has pitted.

Commentator: 'Red Bull are pitting this lap, they might be trying to get the undercut on the Mercedes.'

Undercut by James Vowles May 13, 2021

undercut 

to weaken, damage, or cause the failure of something; undermine:

Large drug cartels can undercut their smaller rivals.

undercut by erudite fuck June 13, 2020

undercut 

a hairstyle in which the sides and back are shaved and long hair is grown at the top of the head

Diago: When i put me hurr in a pony tail y'all can see my short hair
Manne: Ya Diago your undercut is tight

undercut by Eric December 11, 2003

Undercut 

A hairstyle that has been in existance for quite awhile. now branded popular by the dubstep artist Skrillex. Many guys and girls have been randomly on whim deciding to shave one side of their head, do to its growing popularity in the dubstep crowd.

Sadly, only a handful of individuals can actually pull this hair-do off. Leaving a majority of the hip-crowd who think it looks cool thanks to the fame of a certain Sonny Moore, look fairly odd, or unattractive(including Skrillex himself).

Guy 1: Hey man, check out her undercut!

Guy 2: She looks like Skrillex!

Guy 1: We should do it too!

Undercut by MegTieFO October 29, 2011

Undercut 

A very common sort of haircut worn by people with opinions. Often associated with bands like 36 Crazyfists, Avenged Sevenfold, and Dredg. Excessive use of undercuts in association with strumming of chords can cause sudden precipitation, even inside. See also dyess

That's just your opinion, undercuts are indeed common.

Undercut by Alex Bruni March 4, 2005

Undercut 

A sexual innuendo

Person 1: Damn he gave me an amazing undercut last night.

Undercut by Jayasssssssssss March 16, 2017

Undercut Syndrome 

/ˌəndərˈkət ˈsinˌdrōm/

noun
When a female with short hair, or an undercut, has obsessively loved a person who does not love them back.

1: Due to Kayleigh's recent actions, I believe she has Undercut Syndrome.

2: “Emma has been obsessing over Jack since spring, but since Jack doesn’t like her, these are major symptoms for Undercut Syndrome.

Undercut Syndrome by faggeta_1966_ November 27, 2017