Just like Adrenaline but rather from the internet instead. Specifically video games of the MMORPG or FPS genre. See "Boom Headshot" on YouTube.
"What can I say? There's nothing but the rush of hunting people down and killing them! I mean my hearts beating! MY HEARTS BEATING! My hands are shaking! MY HANDS ARE SHAKING! BUT I'M STILL SHOOTING! I'M STILL GETTING HEADSHOTS! It's like BOOM HEADSHOT." -Some Guy Consumed in E-Drenaline
When you get adrenaline from anger, fear, or sorrow you get energized, blood rushes through you and your heart beats faster. Useful for fights, as when you have an adrenaline rush you hardly feel punches and your blows will hit much harder.
He started pushing me and shoving me, and I got adrenaline stacked up. The rage and adrenaline led me to beating his ass, and I'm lighter and smaller than he is.