兔子尾巴长不了

兔子尾巴长不了

Literally means:

the tail of a rabbit can't be long

Actually means:

one's good times don't last long: something won't last long

Rabbits have short tails. The phrase metaphorically means that a person, thing or phenomenon will not last long. Derogatory.

兔子的尾巴很短。比喻某人、某事或某种现象不会长久存在或永远保持下去。具有贬义色彩。