屁股決定腦袋

lit. the butt governs the head (idiom) / fig. where one stands depends on where one sits / one's views are shaped by one's circumstances

buttocks / bottom / butt / back part

fart / flatulence / nonsense / (usu. in the negative) what / (not) a damn thing

thigh / part of a whole / portion of a sum / (stock) share / strand of a thread / low-level administrative unit, translated as "section" or "department" etc, ranked below 科[ke1] / classifier for long winding things like ropes, rivers etc / classifier for smoke, smells etc: thread, puff, whiff / classifier for bands of people, gangs etc / classifier for sudden forceful actions

to decide (to do something) / to resolve / decision / CL:個|个[ge4],項|项[xiang4] / certainly

to decide / to determine / to execute (sb) / (of a dam etc) to breach or burst / definitely / certainly

to set / to fix / to determine / to decide / to order

brain / mind / head / essence

head / skull / brains / mental capability / CL:顆|颗[ke1],個|个[ge4]

pouch / bag / sack / pocket