YOU SAID:
I slammed my penith in a car door
INTO JAPANESE
車のドアにペニスを叩きつけた
BACK INTO ENGLISH
I slammed my dick in the car door
INTO JAPANESE
車のドアにペニスをぶつけた
BACK INTO ENGLISH
I smashed my dick in the car door
INTO JAPANESE
車のドアにペニスをぶつけた
BACK INTO ENGLISH
I smashed my dick in the car door
That didn't even make that much sense in English.