wow is an interjectional word, but "sugoi" is an emphasizing word for adjective and noun. For example, "sugoi kirei" "sugoi hayai" "sugoi koto" "sugoi hito". Therefore,"sugoi" doesn't mean "wow".

Amazing! (describing of a very great astonishment) Amazing! You know how to talk in cat? すごい！猫語が話せるの？(sugoi ! neko go ga hanase runo ?) - Wow (below there are different emotions) Wow! Games! わあー！ゲームだ！(waaA! geemu da !) Wow! He did it again! すごい、また彼だよ。(sugoi , mata kare dayo .) Wow! He's huge! うわあ！大きいなあ！(uwaa ! ooki inaa !)

Thus, it will be a Japanese slang "sugee" (スゲー) meaning an English "Cool". Hip version of "Sugoi", meaning favorably impressed, is also equivalent to the American English "cool" (great, wonderful). So why here the misunderstanding goes on.

can also be 'COOL'

means great