When an inanimate object has been so plastered/drenched/splattered with semen that has not only caked into an oasis of bacteria; the object may almost seem like it has gained sentience and is aware of it's own existence.
"I knew my cum sock was truly semonic when it started telling me to kill my family."
"Man, you still haven't washed that shit? What the fuck? Shit's gonna be semonic soon"