Common casual or slang-adjacent ways to express gratitude in Japanese include saying "domo" (a shortened, casual "thanks"), "sankyu" (a direct phonetic borrowing of the English "thank you" used playfully among younger generations), or "azasu" / "azassu" (an extremely casual, slurred contraction derived from arigato gozaimasu commonly used among close male friends, athletes, or coworkers in relaxed environments).