The concept of, whenever something bad or sketchy happens, splitting up. It was originally applicable in the to moments in the show, Scooby Doo, when the gang was in a group and then splits up to gather clues (often with moderate success and then complications, e.g. Velma loses her glasses). Usage now, though, has come to generally be in regards to two or more people separating, or "splitting up," when it seems illogical to do so.
"What the fuck? You're breaking up with me?" said the boyfriend.

"Yes," said the girlfriend.

"I can't believe that you're splitting up with me! This shit is fucking Scooby Doo Logic!" he screamed.
by Oodles and oodles of noodles! February 15, 2012
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When someone undeservingly stumbles upon success, through sheer luck and usually minimal skill of their own, similar to that of the cartoon character Scooby Doo who would often catch the villain by literally stumbling upon them, usually after he had fallen over or been involved in some sort of zany accident.
Person 1: Hey, how'd you go in that exam?
Person 2: Dude I got like 95%
Person 1: How? I got like 65% and you told me you didn't even study
Person 2: It's the Scooby Doo Effect man.
by Opium Daydream July 21, 2010
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when someone in a disguise in unmasked like in every episode of scooby-doo
person 1: AAAAAAHHHHHHH! A sasquatch!!!!!
person 2: OMG it is!!!!!!!! wait.... why is there a zipper on its back????????????
person 1: I have no idea!!!!
(person 2 pulls of sasquatch's mask)
person 1: WHAT THE HECK THAT'S MY MOM!
person 2: well this is a scooby-doo moment.....
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Its a scooby doo stream because its a fucking mystery when they'll start the game did you see quackity's stream 2 days ago?
Bro Quackity your stream was a scooby doo stream FR FR
by Lolypopqween April 17, 2022
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A sandwich with so much meat, cheese, and other various fillings that it is literally so big that it looks like one of the towering sandwiches Scooby and Shaggy would always eat on Scooby Doo.
Person 1: Dude so I went to the local deli and I got a Scooby Doo Sandwich for only $5.
Person 2: That totally beats subway.
by Rice Menshorts June 13, 2012
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The 5-College Consortium in western Massachusetts can be represented by the members of the scooby doo gang. UMass is Scooby. Hampshire is Shaggy. Amherst is Fred, Smith is Velma. Mount Holyoke is Daphne.
We find evidence for the Scooby Doo Theory in Smith College, also known as Velma, the nerdy one.
by Mary Lyon September 12, 2006
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