Top Definition
The act of receiving head while riding on a train.
I got some train brain on the railroads.
by yins April 17, 2008
1 more definition
5 Words related to train brain
Similar to road head, train brain is getting a blowjob on an extremely crowded train.
Carl: Dude, I got the sickest train brain yesterday.
Chad: Nice, what happened?
Carl: I ended up cumming on the guy standing next to me and getting kicked off the train.
Chad: Gnarly.

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