This can mean many things, all of which are (as the name implies) destructive to the recipient's anal opening.

Noun: Something which is used to inflict massive anal damage (broomhandle, monster dildo, armadillo, shoe, etc.)
Noun: The actual technique of using a tool (as described above) to pound the victim's anal opening into submission.
"After being tied down to prevent escape, the man was given a thorough backdoor sledgehammer."

"I will use this lampshade as a backdoor sledgehammer if you come near my house again."
by Argonak August 18, 2008
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1. The act of ramming one's fist up a partner's anus forcibly, from a distance of at least one foot.
Steve: Hey, Greg, why're you limping today?
Greg: Man, Jorge gave me an Alabama Sledgehammer last night, and I can't walk straight...
by Sting0 November 30, 2007
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A tie with an overly exentuated knot, that resembles a sledgehammer.
GUY 1: 'I'm sick of my boring old tie'
GUY 2: 'Why dont you spice it up with the SLEDGEHAMMER?'
GUY 1: 'Alright!'
(GIRLS SWOON UPON LOOKING AT THE SPLENDOR OF WHAT IS THE SLEDGEHAMMER)
by himz February 17, 2008
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When you cup your penis using the scrotal sack so that the balls are in line with the head of the penis, then use as a hammer on someone's head. Similar to a mushroom stamp.
I woke up to the smell of musty cheese, only to see my friend trying to give me a Wisconsin Sledgehammer
by Huggabear July 13, 2012
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A violent act of rearranging someone's face with a sledgehammer; a song by Deathcore band, Rose Funeral.
The rioter gave their victim a sledgehammer facelift.
by Anime-Freak96 July 17, 2017
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the act of removing one's penis during anal sex, and upon noticing it to be covered in tanish shit, slapping it against your partner.
i gave megan a mean egyptian sledgehammer last night
by starfishmutilater December 9, 2010
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Shitting in a condom and freezing it to make a dildo.
"Shit, I forgot the dildo"
"Well have you got a condom?"
"Yeah, why?"
"I'll make us a Nazi Sledgehammer"
by DeepFriedFrog'sLegs October 22, 2014
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