Cumflation is a term to describe the act of filling up another individuals entire body with sperm, to the point where it bubbles up or in some cases even explodes.
This practise is mainly seen in japanese Hentai, as it is practically impossible to duplicate in real life.
The injection of the sperm itself can either be through means of intercourse, oral or in a broad variety of bizarre ways.
Origin of the term
The exact origin of the term cumflation is unknown, it was however seen in Hentai as early as the 1990s.
Since then there was a massive rise in popularity of eastern culture and abstract pornography, so it has certainly become globalized in the 21st century, which is also when the term Cumflation itself was first used.
Spread of the term
Given the current trend around eastern culture and abstract pornography, there has been a massive rise in interest in things like Cumflation.
It is so present in modern day Hentai that the term also got its own entry in the Urban Dictionary in 2010.
Main online boards to help spread the word about Cumflation include Reddit and 4chan, as their communities seem to have the biggest interest in bizarre media of all sorts.