DRaGZ
Smash Champion
Okay, lemme give you an example you'd understand then because you came from competitive FPS.The difference between this and that is that every character could wavedash, where as not every character can pull an infinite.
Rocket/grenade-jumping in Team Fortress was not intentional, it just came about as an exploitation of the way explosions and knockback physics worked. It was also class-specific.
The DeDeDe infinite grab is not intentional, it's just an exploitation of DeDeDe's grab cooldown frames and how move decay works. It's also character-specific.
Of course, the DeDeDe infinite grab is way deadlier than the rocket/grenade-jumping, but the jumping did give these classes some crazy options.