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A rough method of judging a person's rate of aging. To left test is to view a user's current profile picture on Facebook, which is the most recent, and press the left arrow key. This goes back to the user's first picture, when they were younger. It may span several years, or few, and their mileage will vary.
<while friend is stalking someone on Facebook> Damn, give them the left test!
According to the left test, she's like-new.
left test by midinerd September 11, 2016
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A Left Testicle Decision 

To Make a Choice using knowledge not from you Brain, Dick or Right Testicle, but making the choice from Knowledge from you Left Gonad. This Decision is usually something dumb as fuck like Date Rape or Wearing Socks and Sandals.
Harry: I think I should Get a Donald Trump Cut!
Bennie: Harry you dumb fucking cowpuncher, Stop Making such A Left Testicle Decision!

Sweet mother of Satan's left testicle 

When you see an absolute unit of a fucking spider on the ceiling but you have friends over so, being the comedic relief character in your own life, have to tell something funny in terror.
Sweet mother of Satan's left testicle get the fucking flamethrower, Jerry!

Left Testicle 

The testicle no one likes. Its the one who always is slacking off while the right one does all the work!
Damn my left testicle keeps banging agains the right one. Now suck on it bitch!

Two Left Testicles 

An figure of speech used to express how awful one is at sex (similar to how the expression "Two Left Feet" applies to a bad dancer).
Gee, Mary, I don't know about this... I've got two left testicles.
Two Left Testicles by FalconEyes September 25, 2011

Bestie left testie 

A term used to describe your best friend who, at times, may seem closer to you than your left testicle
"dude, since when are you and dan bestie left testies?"
Bestie left testie by B10xWc October 6, 2009

Left Testicle Pain Syndrome 

When you have a pain in your left tedticle that after you have your pain you immediately get a hard erection that makes your cock 6 inches bigger then max mast and makes you cum 3-5 oz of semen
Oh no, I just had a left testicle pain syndrome episode, god everyone knows