an extremely large, erect penis with three separate heads. Often used in Indian pornography to cut budgets. Has the ability to pleasure three cavities, but does not receive three-fold pleasure itself.
Dude 1: Scariest shit last night at Luke's
Dude 2: What happened?
Dude 1: We were all joking about who had the bigger package and the conversation really got tense. Jeff kept saying his was the biggest and we told him there was no way. He freaked out and yelled " I have a trident dick!" and then we all lost it and couldn't stop laughing. Then he started to cry and just whipped it out. It looked exactly like Poseidon's trident.
Dude 2: Word?