(idiomatic) to be sharp; to be keen; to be on the ball; to have a mind like a steel trap; to be clever

(idiomatic) to get mad; to be highly offended; to get pissed off; to get angry; to lose one's cool

(idiomatic) insane, crazy, nuts, out of one's mind

Alternative form of 頭がおかしい

(slang) a forgetful person

long sword with birds' heads carved on the pommel

incline, tilt, slant

back, behind, rear

a quadriceps femoris muscle

a biceps femoris muscle