Boo-boo, a colloquial term for a minor injury or mistake, has many antonyms depending on the context. In the medical field, antonyms for boo-boo might include serious injury, major medical emergency, or life-threatening illness. In terms of mistakes or mishaps, words like success, victory, or accomplishment might be antonyms for boo-boo. Similarly, antonyms for boo-boo in terms of relationships might include bonding, connection, or understanding. In essence, antonyms for boo-boo are any words that signify the opposite of a minor mishap, mistake, or injury - words that depict success, strength, and well-being.