A vehicle used to compensate for physical and/or sexual inadequacies, typically a full-size American pickup, the bigger the better, usually modified with a raised suspension, bigger tires, extra chrome, louder muffler, etc., and different from true work trucks that are sized and purchased to do a specific job.
When you're sat down on the toilet with your willy tucked down, but it then gets big and lifts the seat with you on. That's a fork lift dick truck.
Oh no I sat down on the toilet with my willy tucked down, but it then got big and lifted the seat with me on. That was one major a fork lift dick truck!