A MIG (Metal Inert Gas) welder. So called because it acts like a hot glue gun but for metal. Is often used by someone with very little to no training so their weld beads look like snot.
Easiest way to get a broken bolt out of a hole is to stick a nut on with the Hot Snot Gun.
Though used more in reference to a person who has got right up one's nose.
Abandoned Snot.
The no longer wanted content of the nose, or that which one would rather get rid of. Also used to describe a person you no longer wish to have contact with, or one who talks absolute cod swallop that is worth abandonment rather than listening to.
When his or her comments are of such a needless nature that they would rather better be discarded or disposed of.
"Christine'sopinion on the matter was clearly worse than a blob of snot flicked on the pavement."