Definition 1 of 1
\Deemaag ka daahi\
This is street lingo to depict a situation when someone is eating head (sar khaa raha hai) to such an extreme that the mind shuts down.
Popat: Arre babu, dimag ka dahi mat kar, kal exam ki padai karni hai.
(Arrey Babu, don't do any dimag ka dahi on me... I have an exam tomorrow to study for).
Added 2011-08-19 by Bombaywala