A prank that parents play on their children when they’re old enough to drive. Blinker fluid/fuel is not real but is a common joke, most shop owners play along or will laugh at you.
Run down to the auto parts store and get me some blinker fluid”, but when Billy went to the store the managers just laughed at him.
by Hardtruths January 2, 2018
An imaginary liquid used in automobiles (to make the blinkers work). This term is used as a sarcastic remark toward someone who knows ablsolutely nothing about cars.
Bob: "My car's broken again. I don't know what's wrong."
Jon: "Did you check the blinker fluid?"
by Peaches Witherspoon August 23, 2005
A sarcastic term used to ridicule those who don't know shit about cars. Similarly 710 cap and Muffler Bearings are used in this way.
"You need some blinker fluid for that?" Asked Tom.

Darryl, who knew nothing about cars and was knee deep in his truck trying to fix a broken radiator, replied "I don't know, I might."
by John4646 June 6, 2018
(btw i totally met a girl who fell for this)

a really good almost-real-sounding term to use with the intent of throwing off a ditz.
Crystal: "My right blinker doesnt work."
James: "You're probably out of blinker fluid."
(later at auto zone)
Crystal: "I would like to buy some blinker fluid, please."
Clerk: "What the hell??"
by jackieshmackie March 14, 2006
An imaginary fluid in cars which enables the turn signals to work.
Aggrivated Driver: This asshat keeps changing lanes without using his signal!
Sarcastic Wife: He must be low on blinker fluid, honey.
by Merkle March 13, 2006
Often heard on the CB between Truckers. If a driver has passed them and left a turn signal on, they will call up and tell them they are running out of "Blinker Fluid"
Hey that Bull Hauler that just passed the FreightShaker in the hammer, your gonna run outta Blinker Fluid.
by Wee Ph1l March 13, 2006