A blue hedgehog that can run faster than the speed of light. He has a sidekick named Tails, who is an orange fox that can run fast too, but not as fast as Sonic.
Damn, Sonic ran so fast that I can't even catch him.
by Solid Snake 9000 May 22, 2010
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Describes a action, awesomeness, used in place of sweet or cool.
That was so sonic

That snowboard is so sonic

That car is so sonic
by JD Marzec January 15, 2009
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1: (Noun)Sonic is a millennial from 1960 who gains speed after giving Amy Rose the good old Alabama hot pocket. He has to deal with his dad CWC who has a mental breakdown whenever someone says that they have a big peepee

2: (Noun) Sonic is a video game character who runs fast first introduced in the 90s. Sonic has now been turned into furry bait
Oh Look at that sonic goes he's about to give Amy the Alabama Hot Pocket
by GrapeTheEpicGamer December 17, 2018
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Someone who obsessively runs fast without any prior reason or excuse on why they are always in a hurry.
She was a total Sonic last night. She kept hurrying for no reason. I tried to help her calm down but her Sonic-ness had got her carried away with her daily chores which I was doing too.
by Justicewithtacosandweed August 10, 2018
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Sonic is another word for speed. Speed is amphetamine, a stimulating drug that triggers the brain’s reward system giving the user feelings of pleasure. Speed is not meth!
"I turn sonic for money, in the trap monday to sunday" - Pooh Shiesty
by Dolo G March 29, 2021
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