Frustrated cum would be when your having gay sex, yet you yourself are straight. But, you have to please dumbledore, your headmaster, and your daddy. So you try your hardest -- but in the end all that comes out is one small, pathetic spurt, as dumbldore sighs at the sight of your pathetic, flaccid duck.
Ron Weasley caught Harry Potter with his pants down, awkwardly gripping his dick in front of Hagrid.
"Bloody hell!" Ron said, staring at Harry's frustrated cum.
A condition in where a copious amount of alcohol has been consumed and one cannot ejaculate during drunk sex. Mostly found in males. Not to be confused with Whiskey dick where the male can't manage an erection. With this condition, a male is able to get an erection but can not reach sexual climax.
"Are you almost there?"
"Nah baby, I'm too numb to cum."
"Okay we can just finish in the morning."
That Perplexing cum that you thought you had cleaned up after spanking the dolphin. The cum that, to your dismay, soils you boxers, pants, and sometimes shoes.
(A man pulls up pants after taking care of business) "Goddamnit, I thought I cleaned all that shit off! Now it's all in my boxers and dripping down my leg!"
It looks like he should have checked for ghostcum!