No pain, no gain, no idea what half these terms mean.
The state of being extremely muscular, where your body looks like it was sculpted by an artist who only knew how to make things bigger. Getting jacked requires years of dedication, perfect nutrition, and the willingness to spend more on protein than rent.
Easy, purposeless running that doesn't improve fitness because it's too slow to build aerobic capacity but too fast to count as recovery. The cardio equivalent of empty calories.
Ski slope terminology for an inexperienced skier who carves across the entire trail like they're mowing a lawn, oblivious to everyone behind them. Named after baby kangaroos for their awkward, unpredictable movements. They're the reason experienced skiers develop trust issues and defensive skiing techniques.