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"Cooool" as in mockingly and definitely NOT cool. Often used with modifier "wicked".
What a wicked synchro paisely shirt!!!
synchro by rjs May 26, 2004
transforms an angular position of the shaft into an electric signal.
I have to replace the synchro so it can work.
Synchro by Sneakers February 1, 2023

Synchro-speech 

To say a word or phrase at the exact same time as another person. Was, in the Dark Ages, identified with a "Jinx! You owe me a Coke!
(watching the the Crocodile hunter)

Lea/Ale: Look, crazy guy!
(bewildered stare)
Lea/Ale: Stop it.
(frightened stare)
Lea/Ale: AHHHHH

(later)
Ale: What a fine example of synchro-speech.

Synchro-nut 

noun
When two or more persons engaging in sexual activities orgasm and/or ejaculate in concert.
verb
The act of orgasming and/or ejaculating in concert with one or more other persons.
noun
That was the best synchro-nut I've ever had.
verb
There's nothing quite like synchro-nutting with one of your best homies.
Synchro-nut by MostValuableB November 25, 2018

Synchro noob 

a player of yugioh who gets to win almost ever game by useing synchro monsters
bob is a synchro noob for useing snychro monsters.

synchro-defecation cycle 

The synchro-defecation theory holds that the defecation patterns of individuals who live together tend to become synchronized over time. The phenomenon is glaringly evident when said individuals share one bathroom.

Similar to the McClintock effect, the theory that the menstrual cycles of women who live together, such as in homes, prisons, convents, bordellos, dormitories, or barracks, tend to become synchronized over time.
Man: "I had to shit in the tub this morning 'cause my girl got to the toilet first. "

Friend: "Damn, that synchro-defecation cycle is a bitch, ain't it?"