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.
by weyus February 5, 2021
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