There are two meanings in it.^^ 1) kinda slang meaning "very" "really" (= 非常，实在，真的。。) It's very hot today > standard one : "오늘 진짜(=정말) 덥다." > using the slang '되게', "오늘 되게 덥다." 2) It could be a part of "되게하다" (which is sorta conjugation of "되다(to become)") meaning "to make something happen" or "to make somebody something" He made his son a doctor. 그는 자기 아들을 의사가 되게했다. = He forced his son to become a doctor.^^ ^______^

되게 = Be