Fear of male sexual excrement that goes beyond fear of spitting/swallowing. One suffering from cumaphobia usually substantiates her fear by delivering meaingless threats such as "If your cum comes anywhere near my face I will wipe it on your shirt."
These threats are worthless because those suffering from cumaphobia fail to realize that a messy shirt is worth a shot in the face.
"As I was about to cum, my girlfriend freaked out. Realizing that she suffered from cumaphobia, I helped her face her fear by shooting a load all over her face."