A half handjob, half bagtag. Usually performed under hammed circumstances when the woman's decision making is poor. Unfortunatly, when told to go faster the woman speeds up and smashes your nuts to peices. Also known as the HJ(handjob) Hodge.
"Man, she was giving me a handjob last night but her dumbass friend told her to go faster, and it turned into a sledgehammer."
by Canuck19 January 22, 2007
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Woman lays down on a couch and puts her legs over the mans shoulders. Man rests his feet on the end of the couch and "pelvic thrusts" into the woman.

Warning! Results may include; ulta-orgasm, broken back, and/or broken penis.
I had to go to the hospital last night.
Why?
I had to take my girl there cuz I may have broken her back doing the Sledgehammer.
by tbsveryfunny July 12, 2010
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Worlds fastest Corvette manufactured by Callaway.
Most expensive corvette produced for it's time
$400,000.00.
Sledgehammer
1/4 Mile= 10.6 secs @ 127mph
top speed= 254mph
0-60 time 3.9sec
by James Adamcheck September 17, 2006
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"big hammer", serious tool, not carried in pocketz,and not used with nails, more like used fo` whacking down anything else.
(also total humour series, starring
by some actor named david, watch out for Sledge.)
by saywhaaat December 11, 2003
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A fart smelling soooooooo damn bad that the person's head instantly recoils back. Most of the time, this fart is silent.
Bruce: *toot*

Claire: *SWINGGGG* EWWWWWWW *coughs*

Greg: EVACUATE, IT'S A SLEDGEHAMMER!!

Bruce: *whistles*
by Ni_Mader_JiJi_Bao_Zhe June 17, 2010
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A person who tricks another person in to thinking they are romantically interested, only to ignore them later on.
"She stopped answering his calls, that girl is a sledgehammer."
by js2011 October 5, 2011
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A method of contraception that involves sledgehammering a girl in the ovaries.
After sex I always pop down to the shed and grab the sledgehammer and go to town as a form of contraception
by J Bag/ Dirty Jamo February 25, 2020
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