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Another meaning for testefy:

To defile a target object or person using your scrotum sack, causing them to be immobilized with fear, giving you an unfair advantage over the victim.
Hey Jack, I should wake up George and testefy him.

That kids balls hang so low he testefies the grass when he walks.

Breaking news: Man dies from testefication.

The local testemorph testefied his dog and it died.
Testefy by MrGibblet May 13, 2009
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To exert a large amount of force or pressure to a male's testicles or general genital area.

Pronounced Teste-fy.
You've been TESTEfied.

Shut up, or I'll testefy you.

Kid 1: You're a jerk!
Kid 2: You have no balls *kicks kid 1 in groin*
Kid 3: You've been testefied by Kid 2!
Testefy by MrGibblet May 12, 2009

testifying 

get yo testifying ass in the trunk nigga
testifying by toastedbread July 7, 2011
You two are wrong. "Testify" comes from the Latin "witness" and has nothing to do with "testicle" which also comes from the Latin for "witness". I was asked this in class by the professor in college English. I would have been wrong and embarrassed myself, so I just said "I don't know". But here's what I got from the Internet:
testatio -onis f. calling to witness , or bearing witness.

testificatio -onis f. bearing witness , testifying; evidence, proof.

testificor -ari dep. to bear witness to , give evidence of; to show, bring to light; to call to witness.

testimonium -i n. witness , evidence; proof, indication.

testis (1) -is c. one who gives evidence , a witness; an eye-witness, a spectator.

testor -ari dep. (1) to bear witness to , give evidence of; to make known, publish, declare; as pass. to be attested, declared. (2) to make a will. (3) to call to witness.

BTW they are called "testicles" because they WITNESS to the procreative power of a man.
Since I was a witness to the crime, they want me to testify in court.
testify by Carey1234 March 14, 2009
1. To give one's information "as truthfully as possible." Taken from an old Roman phrase "to swear on one's testicles." Now, think about that, and think about how differently court cases would turn out if that meaning held true to this day...
"Testify" is usually used in reference to a court setting or a confession of some sort.
testify by aka_Pyro July 28, 2007
A greeting or callback created for the Repo Army (fan-base) for 'Repo! The Genetic Opera', a film written and directed by Darren Lynn Bousman. It is similar to the "ribbit" callback for 'The Devil's Carnival'.
Person#1: This is Sarah. She's starting a shadow cast
Persons#2, #3: Testify!
Testify by lolzitsme July 28, 2012
To attend a religious revival event, during which you would be prompted by the preacher to testify.

The act of testifying normally involves babbling incoherently while sharing folksy stories of your nasty life being turned around because the creator of the universe decided to pay you a personal visit and issue a get out of jail free card. He's nice like that, and as a pensioner he has a free bus pass allowing him to travel anywhere in the world.
Peter Popoff: Testify brother!
Hick: Well, I dun gone crashed mah car while drunk, and then I cheated on my sister with mah cousin. I's a sinner, but the baby Jesus came in to mah trailer and fixed me up good. Now I 'aint feelin' no guilt when I'm porking mah cousin.
Testify by DairyGod June 22, 2009