A cross between an oatmeal raisin cookie and a rotweiler.

grab some Quaker Oats and stuff some in her Snizz, you then begin to plow the lady and when you blow your load, keep it going. The heat from the passion cooks it to perfection.
You then dismount and feast.

Another way of saying that you need to throw up/vomit but can’t because there is no where for you or someone to let it out. (The oatmeal part coming from that fact that oatmeal looks like vomit)

Mouth Oatmeal is raw oatmeal with saliva substituting for the water/milk you’d mix it with.