The Plastic Hammer 

A small blue plastic hammer of approximately 6 inches in length, owned by Mary, used for certain offensive purposes. Unlike Maxwell's famous Silver Hammer, Mary's Plastic Hammer is incapable of killing anyone, or even doing any significant damage. Instead, any individual who is hit on the head with the hammer is immediately turned into a nerd upon impact.

Little Mary had been playing with The Plastic Hammer for an hour or so when she became bored and tossed it behind her back, hitting Maxwell, her older brother, in the head and turning him into a nerd for the rest of his life.

The Plastic Hammer by Encyclopedia Shitannica January 26, 2014

mack hammer 

the mack hammer is a figurative hammer that one "lays" when one "macks" on a woman. this occurs only when one macks and does not enter the "friend zone." to lay the "chisel" is the opposite of laying the mack hammer, it is to enter the friend zone. to "thattababe" is to lay down the mack hammer with all the authority that one can muster. mack hammer is most often used in the phrase "lay the mack hammer down" with a gesture of using a hammer.

Tay lays some serious mack hammer dude, thattababe.

No one lays the mack hammer down like the Piecerkids.

Hey Lauren is it ok if i lay the mack hammer down on your mom?

Scott is dual wielding!! Lay the mack hammer down!

Dude, Govan is in the friend zone, he totally chisels.

mack hammer by thattababer June 15, 2010

Underground Hammer 

The act of have a finger shoved up a males ass while A) getting a blow job or B)Jerking off

She was blowin' the hell out of me and finished me off while giving me an underground hammer

Underground Hammer by Snaggeltooth 27 November 27, 2010

alabama clam hammer

Much like an "Alabama clam slammer," the male does a hand stand during intercourse and on his decent he slams his penis in to his partners butthole

I was with Cathy and I gave her an Alabama clam hammer and ended up wearing a pink sock!

alabama clam hammer by Dookie84 June 28, 2016

I just Wanna Dance and Wave My Hammer

When there is a lot going on and you just want to dance and have a good time. Hammer is interchangeable for any item that is in your hand when you are ready to dance.

Geoffrey: Oh my god, this meeting is so boring.
Lauren: Are we ever gonna get to the club?
Donovan: I know I just wanna dance and wave my hammer.
Meng: Me too, CFW

I just Wanna Dance and Wave My Hammer by HoldenPhrases June 10, 2011

Dry Hammer 

When a man surprises his partner with sudden penetration with no foreplay. Sometimes painful but always enjoyable.

I had a huge morning wood and there she was, so I Dry Hammered her while she was asleep.

Dry Hammer by Mariaras June 26, 2006

Akron Hammer

A sexual position that originated in Akron, Ohio. It was later stolen and known as "doggy style" but the hometown people know their roots.

I'm going to that chick's house tonight. Hopefully she's easy enough for me to give her the akron hammer

Akron Hammer by Zak Keasey January 1, 2010