When you're afraid of blowing your nose in public, so you just pinch the snot into your face mask. It is indeed a disgusting sensation.
"I really had to blow my nose on the bus, but I didn't want to make anyone scared ... so I blew it into my face mask."
"That's what I call a snot burrito!"
A person with no sophistication, and is simply personally disgusting by nature, often associated with pink people who pick their noses and sometimes eat what comes out.
Oh my God! That guy is such a snot picker. He’s sitting there picking the skin from his ears and chewing on it… How gross!