To infer that someone's cognitive function is on the lower end of the spectrum by alluding to "Sped". Sonic is widely regarded as a very speedy character and sonic is an attempt to play on the word sped. Attaching Sonic to the brain means sped brain for lack of a better phrase.
*Plays game*
John: "Kill him, he is one shot."
Bob: *Misses every shot*
John: Do you have sonic brain?
John: "Kill him, he is one shot."
Bob: *Misses every shot*
John: Do you have sonic brain?
by Pogopawee March 19, 2021
Get the Sonic brainmug. by Big Poppa Frost October 11, 2007
Get the Brain Casemug. by Fitter26 December 11, 2019
Get the Gains brainmug. A humorous animated cartoon shown after an extremely scary horror movie which has a calming mental effect similar to the physical effect of drinking a glass of milk right after eating extremely hot/spicy Mexican cuisine.
Gee, that Woody Woodpecker cartoon the theater ran right after that scary movie was real brain milk and made me feel better, less likely to have nightmares tonight.
by Red Sam Black October 26, 2014
Get the brain milkmug. profuse, intermittent absentmindedness occurring during and around the 9 months of pregnancy that would lead one to assume brain injury if said person were not pregnant.
husband: "My wife told the same story 3 times. Then she spent a while looking for her phone whilst talking on it. Must be preggo brain."
by EddieMame August 6, 2013
Get the preggo brainmug. Where your brain expels it's cells IQ Count so your particularly Retarded on a certain amount of time (seconds, minutes, etc)
by PlsLaughAtThisName March 12, 2020
Get the Brain Nutmug. 