Pejorative for the late Fast & Furious actor Paul Walker (1973-2013), which is used by the detractors to express desdain towards F&F fanboys (including those who make replicas of the cars driven by one of the characters, Brian O'Conner).
Guy 1: "Heya, look at my perfectly accurate replica of Paul Walker's Supra! I can't wait to beat Ferraris!"
Guy 2: "Ugh, another Poop Wanker wannabe."
Guy 1: "Bro, what the fuck are you talking about?"