An Erectum is when the man inserts his penis into his partner's ass before it is erect, and then it becomes erect while sitting inside of their partner's ass.
"Did you hook up with that chick last night?"

"Yeah, we had an Erectum."

"...the fuck is an Erectum...?"
by CJSummer July 16, 2015
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When you have to poop so badly that your rectum feels hard. It is often harder to get all the poop out when you go since it is dense and very hard.
by spidurmonkie September 9, 2012
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Erectum; a horny ass hole.
Omg I have such an erectum, my ass is gagging for penetration!
by Kim_size January 31, 2017
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Sexual arousal sensations Like Erection, only with your Rectum.
OMG I have the hardest erectum, my ass is just asking for it.
by Khimler May 23, 2020
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When you are really horny, only with your ass hole.
OMG, I have such an erectum, my ass is gagging for it.
by Khimler December 23, 2016
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