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.