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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.
by PikaChar July 13, 2013
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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.
by MYsterious zanacara July 31, 2018
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