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1.
A pacemaker (or "artificial pacemaker") is a medical device designed to regulate the beating of the heart.

The purpose of an artificial pacemaker is to stimulate the heart when either the heart's native pacemaker is not fast enough or if there are blocks in the heart's electrical conduction system preventing the propagation of electrical impulses from the native pacemaker to the lower chambers of the heart, known as the ventricles.

People with Pacemakers are naturally weak and would otherwise die, but with a pacemaker are able to live through the miracles of modern science, thus making them part robot inside.
John had a Pacemaker put in so that he could live an (almost) normal life again.

by the juicebox September 19, 2006
 
2.
A medical device that works in conjunction with an individual's forward whatsits to make them go faster, typically used for people who are experiencing a life-threatening loss of momentum (going too slow).
Person 1: "I heard that Hamish got a pacemaker implanted.
Person 2: "Yeah man, apparently he almost died of slow feels"
by sanic May 26, 2014
 
3.
extend sex in males by ( calling cadence ) a chant that is sung softly:
Ok honey 7 long strokes ( rest count 3). Ok honey 5 sucks (rest 4 counts). softly count 1...7 one,two,three.
WOW 10 short strokes NOW, rest one, two, three, four, Kiss, kiss, kiss. Kiss my pace maker.....
by itichie_nocanpo August 10, 2006
 
4.
A pacemaker (or "artificial pacemaker") is a medical device designed to regulate the beating of the heart. The purpose of an artificial pacemaker is to stimulate the heart when either the heart's native pacemaker is not fast enough or if there are blocks in the heart's electrical conduction system preventing the propagation of electrical impulses from the native pacemaker to the lower chambers of the heart, known as the ventricles. People with Pacemakers are naturally weak and intended by God to die, only to live through the miracles of modern science, thus making them living freaks.
John has a Pacemaker, yo!
by Mr. Mammon April 15, 2006
 
5.
means to have sex at a very slow rate
dude elanor had pace maker last night
by wanna horndog May 06, 2005