A trunk eater is one that takes part in oral butt sex also known as eatin out the bootyhole.
bob-Yo,did you here that homeboys a trunk eater.
tom-word,youll never catch me eating trunk.
Every possible space is taken inside the car, driver, shotgun, both window seats, bitch, double bitch, and diver. So the last person has to ride trunk.
Danny (just dove into diver seat) " Lex, looks like your trunkin it"
Lex (person summonsed to the trunk) "Fuck, alright just dont go over any shitty roads"