Refers to a porn star or a "slutty" version/doppelganger of a friend or someone you may know
Person 1: "I was on pornhub and I saw a porn star that looked like that girl from chem class."
Person 2: "No way! She has a doppelboner!!"
Your evil twin boner
A boner that looks exactly like yours
i was in the bathroom the other day and peeked over the divider and the dude on the other side had my doppelboner!
I heard steve just banged that girl ive been trying to get with for the past 6 years! he must have my doppelboner!