ingratio 

Providing fellatio in order to ingratiate yourself to one or more people and get something you want in return. While this can literally occur, often it is meant euphemistically.

Bob, hoping to get a job after some time being laid off, considered the idea of ingratio with respect to his new job.
During the interview he thought "Gentlemen, I'm excited to start sucking this cock." Luckily, he did not say this out loud.

ingratio by weyus February 5, 2021

Intration

To understand that you are in the wrong and have no right to be angry, and yet experience anger anyway

Instead of lashing out like he always does, this time John experienced intration.

Intration by あゆー March 21, 2021

intration

(noun) 1. a comment or action that makes no sense which is a result of being overtired

Colette just had an intration moment.

intration by Andrew Willert December 8, 2006

inegration with respect to the moon 

The act of mathematically integrating with respect to the variable the moon.

Should not be attempted unless no other methods to solve the astronomy problem seem likely to give an answer.

Guy 1: Fuck I have no idea where to even start with this question

Guy 2: Time to do some inegration with respect to the moon (:

inegration with respect to the moon by Quantum Guy August 2, 2010

Ingratitude 

Ingratitude is thinking nothing of what has been done or given to you by someone else. That is to say, not feeling bound to show gratitude. In other words, ingratitude is a discreditable lack of gratitude. In fact, it is simply lack of appreciations or thanks for something given or done to you or to someone else. -Emeasoba George

Ingratitude is synonymous with thanklessness or ungratefulness.

Ingratitude by Emeasoba George June 22, 2018

ingratiate 

High-brow way of saying "sucking up to someone"

Ram Kumar was trying to ingratiate himself with the Guptas.

ingratiate by LexicalIndian October 12, 2013

Ingratitude 

A discreditable lack of gratitude.

he returned his daughter's care with ingratitude and unkindness’

Ingratitude by Jhon alraisi September 12, 2017