YOU SAID:

Stick your head in your underwear

INTO JAPANESE

あなたの下着にあなたの頭を刺す

BACK INTO ENGLISH

Stab your head in your underwear

INTO JAPANESE

あなたの下着に頭を刺す

BACK INTO ENGLISH

Bite your head in your underwear

INTO JAPANESE

あなたの下着にあなたの頭をかぶせ

BACK INTO ENGLISH

Cover your underwear with your head

INTO JAPANESE

下着を頭で覆う

BACK INTO ENGLISH

Cover your underwear with your head