Resembling or having the characteristics of a champion; informal term suggesting competitive spirit or winning attitude.
From champ (informal shortening of champion) + -y (productive English suffix creating adjectives). This is a very informal, colloquial formation likely originating in 20th-century sports slang.
'Champy' is the kind of word that emerges in sports bars and locker rooms—it's not in most dictionaries because it's too casual and recent, but it perfectly shows how English speakers constantly create new adjectives by adding -y to nouns they want to turn into descriptors.
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