mentally drunk 

To be mentally crazy and make very weird decisions.

Dude, you were so mentally drunk that you had sex with a Mexican girl while you are in a relationship with someone else.

mentally drunk by PikaChar August 26, 2013

Mentally drunk 

when you get so tired you sometimes cant think strait and you start being silly for no reason

someone: man your getting really mentally drunk!
someone2: i know, i think imma do something and put something on urban dictionary.

Mentally drunk by MYsterious zanacara July 31, 2018