When a promiscuous female (or homosexual male) has had semen ejaculated into their mouth/vagina/anus so many times by many different partners that the area begins to smell like old sperm.
"Mate I took Scarlet home last night..."

"Ouch! How'd it go?"

"Not good, she had a wicked case of cum hum..."

"Not good then?"

"Oh God no, I thought I was going to throw up on her and end up churning her butter!"
by MattyHavoc December 19, 2011
When a female (or homosexual male) has had so much sperm ejaculated inside of them (anus, mouth or vagina) that these areas actually smell like old sperm.
"Oh man, I took Scarlet home last night."

"How was it?"

"Terrible, she had a wicked case of cum hum."

"Oh man, that's horrific."

"Tell me about it, I almost threw up."
by MattyHavoc December 19, 2011

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