Often occurs after a guido performs a massive amount of fist pumping for a prolonged period of time. Similar to tennis elbow; just much more jacked and tan. Side-effects of this ailment can include: Elbow soreness, swelling in the elbow, inability to effectively consume jaeger-bombs, and retards a guido's ability to partake in their ritualistic pumping of the fist.
Man 1: Why is that guido pumping his fist so awkwardly?
Man 2: He was at an all night rave and pumped his fist so hard he contracted guido's elbow.
Man 1: Wow that sucks. Fucking guidos...