Vaginal fluid on the brain, is when you cant think of anything else but vaginal fluid and sex. Approximatley 99% of human males are affected.
Dude1: man i cant stop thinking of sex today

Dude2: Sounds like you have a case vaginal fluid on the brain.
by micky mcgee June 28, 2011
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on a certain day of the week (mostly on mondays) someone might feel retarded or simply stupid. Some beleive it is caused by vaginal fluid that may be in the brain. It is normally caused by fatigue or mostly a hangover.
"holly shit today i had at least 87% vaginal fluid on the brain!"

how come?

"its a monday u fuckin retard"
by Anita Whore May 13, 2008
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