Do you know what's the meaning of the expression "comerse un moco" in Argentina?

Question: Do you know what's the meaning of the expression "comerse un moco" in Argentina?
If you translate literally means: "to eat a snot"...ugly, right?
However, in everyday life we frequently use this expression to mean: "to make a mistake being totally unaware of it"
In your job, if you realize for example that you have made a mistake and you deleted an important database by accident, apart from being fired you may say "Uy...qué moco que me comí!!" something like "What a snot I ate myself!".