Slang
Wasei-eigo in the Slang category — 3 words that look English but mean something completely different in Japanese.
ファイト
faito
A cheer of encouragement ("Go for it!" / "You can do it!" / "Hang in there!") ≠ fight
マイブーム
mai būmu
One's current personal craze or obsession; something you're really into right now ≠ my boom
ワンパターン
wan patān
Predictable / repetitive / formulaic / a one-trick pony ≠ one pattern