The act of someone proceeding to deep throatyour dick so far down that your nuts rest on their chin, giving the illusion of two eggs resting on their face.
Man, my wife is awesome. She deep throats my cock like I'm going to die tomorrow. She really must really enjoy those chin omelettes.
the act of busting a load on a girls face, and having it ultimately drip down her chin. the texture of the semen and its elasticity are what create the illusion of eggs, hence the term "chin omelete."