Chicharonez con leche

In spanish it literally means pork rinds with milk. The disgusting sound to it makes people crinkle their nose. It is used to describe a weird, random, or awkward person or situation like the literal meaning.

Because it sounds so strange, people use it randomly to break the boredom or awkwardness in a conversation. Most of the time it is used when the other user replys just "LOL" because everyone knows that means they are bored of you.