2 definitions by Lizbo

Top Definition
A word meant to have meant "fantisize", but the person is so lost in a brain gasm and illiteracy that it came out wrong.
"Hey, when are you going to hook me up with your hot sister? So I can stop sanisize(ing)"
by Lizbo June 12, 2008
An unintentional orgasm without any real stimulation so it's all in your mind.
"Oh emm gee. I totally just had a brain gasm while laying down infront of the fan watching t.v."
by Lizbo June 12, 2008

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