Butt.
The Urdu word tashreef is a polite and respectful way to refer to someone's presence. It is commonly used as "tashreef layiye" (please come in) and "tashreef rakhiye" (please have a seat). However, since 'rakhiye' means 'put down', tashreef is sometimes interpreted as 'butt', especially among Hindi speakers.
Person 1: Tashreef rakhiye. (Please have a seat.)
Person 2: Jee nahi. Chaar ghanton se baitha hoon. Ab tashreef dukhne lagi hai. (No thanks. I've been sitting for 4 hours. Now my butt hurts.)