To engage in the act of being a train while acting like a cock. If a cocktrain derails, it is to puke violently due to excessive drinking. Usually of caesar.
Wow, cocktrain sure derailed last night.
by -es March 02, 2007
3 or more guys having anal sex and the guys in the middle have a cock in their ass while fucking a guys ass in front of them.
Dude! Did you see those guys running a cocktrain?
by NCMama January 26, 2015