Errectum 

When you get a boner by looking at asses. Usually female asses.

Guy #1: Did you see ______ lastnight?

Guy #2: Yeah, man. _______ gives me an errectum.

Guy #1: An errectum? What's that?

Guy #2: You know? An errectum. Where you get a boner by looking at a smoking hot ass.

Errectum by Beau Vyne March 29, 2010

Erectum 

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...?"

Erectum by CJSummer August 6, 2015

Erectum 

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.

"I need to poop so bad. I have an erectum."

Erectum by spidurmonkie September 9, 2012

Erectum 

this word is pretty self explanitory

what the hell is an erectum?

Erectum by funkblaster4000 July 21, 2006

erectum 

Like Rectum, but refers to the Shaft

Why do i pronounce Rectum as Erectum?

erectum by Your Best Idiot April 1, 2010

Erectum 

When you are really horny, only with your ass hole.

OMG, I have such an erectum, my ass is gagging for it.

Erectum by Khimler December 22, 2016

Erectum 

Erectum; a horny ass hole.

Omg I have such an erectum, my ass is gagging for penetration!

Erectum by Kim_size January 31, 2017