The sleep-deprived, often disorienting way a person feels after working on so many impending deadlines their life has become a blur, usually made possible by the regular consumption of several litres of caffeinated beverage in short amounts of time.
Employer: "Have you been here all night? You look like shit!"
Employee: "Yeah, a bad case of brain-lag..."
{employer leaves cubicle}
Employee: "...bastard."
Brain.lag is a tiktoker that makes everyone cry with their sad bungo stray dogs headcannons/scenarios. brain.lag is very famous. Brain.lag has millions of followers on tiktok (manifesting this)
“Have you seen that new video from brain.lag?”
“Yeah, it made me cry”