noun
amazing feat; trump card; earth-shattering thing
Colloquial wasei-eigo used for a surprising, game-changing move or achievement. Often appears in phrases like ウルトラＣを出す or ウルトラＣ級の.
wasei-eigo (Japanese-coined English), from ultra C
彼はプレゼンでウルトラＣを出して、一発逆転を狙った。
He pulled out an amazing feat in the presentation, aiming for a dramatic comeback.
That idea is truly an earth-shattering, game-changing plan.
noun
very difficult C-level skill (in gymnastics)
Original, dated sports term from artistic gymnastics, referring to an extremely difficult C-rated element. Now mostly replaced by modern difficulty ratings, but still understood in historical or nostalgic contexts.
かつて体操競技では、ウルトラＣと呼ばれる超高難度の技があった。
In gymnastics, there used to be an extremely difficult skill called 'Ultra C'.