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2.
When a really long turd protrudes from the butt. The turd is not released; the tension on the end of the turd exerted by the sphincter is enough so that the turd maintains its protrusion without breaking off or being retracted. This creates a silhouette of an erection, where the turd resembles the shaft and the buttcheeks resemble the balls. A butt boner.
"Check out this long dry one, bro! A perfect butt boner!"
by yaolinglingjiu December 23, 2011
 
1.
When you see a hot girl and the blood starts to flow,
fills up your genitals, nowhere left to go,
gotta go somewhere, and gotta go fast,
"where did it all go" went right to your ass!

-Essentially a boner, but not with the penis, with the ass. Happens when your blood overflows your penis during a normal erection, fission occurs, and it is forced into your "ass cakes". Your anus then become extremely hard as if you have an "erection of the anus"
I've got a butt boner for you! *"for who?" I got a butt boner and it's enough for two.

I got a butt boner that is big and black. So why don't you come and lick the dust out of my crack?

I got a butt boner bigger then a stick,

so come and give my butt a lick
*"butt boner"
ITS A BOOTY ERECTION *
IT WILL PASS AN INSPECTION *
IT IS QUITE A PERFECTION *
THE HARDNESS IS MANIFESTIN' *

ITS AN ERECTION OF THE BOOTY *
IT IS QUITE A BEAUTY *
IT CAN BE A LITTLE MOODY *
AND IT SMELLS LIKE DOODY *

WHEN THEY SEE IT GIRLS START SMILING! *
I BROKE MY PHONE BUTT DIALING! *
DRAWS ATTENTION AT THE MALL! *
GIVES A NEW DEFINITION OF "BOOTY CALLS"! *
by Quinrek Barmour January 06, 2012
 
3.
the term used when you have to go to the bathroom so badly that you have surpassed "prairie dogging" it and now have a good two to three inches of turd protruding from the back of your shorts. Thus, you are sporting a "butt boner". OMG, is that a tail? Nope, just my butt boner. Can you point me to the nearest shitter?

shit, poop, turd, prairie dogging, take a dump, pinch a loaf, lay some brown pipe, cut some lumbar
Friend #1 - "I have to go to the bathroom so bad!"
Friend #2 - "Oh man, are you prairie dogging it?"
Friend #1 - "Past that dude, I am sporting a full fledge butt boner!"
by Erika's Bitch February 14, 2012
 
4.
The feeling you get in your rectum when you are about to take a crap but are holding off before you absolutely have to go.
I KNEW this was going to be a good shit. I had SUCH a butt boner.
by oak tree out front June 13, 2011