「有事就兄弟，冇事就契弟」

(pos:語句)
<explanation>
yue:有利用價值就稱兄道弟，喺危急關頭就反面或者卸責
eng:to describe a utilitarian friendship that is fragile and unreliable when problems arise; literally: to call you "my brother" only when one needs you, but to call you a jerk once you are not needed
<eg>
yue:你唔好以為佢當你係拍擋，佢有事就兄弟，冇事就契弟。 (nei5 m4 hou2 ji5 wai4 keoi5 dong3 nei5 hai6 paak3 dong3, keoi5 jau5 si6 zau6 hing1 dai6, mou5 si6 zau6 kai3 dai6.)
eng:Do you think he regards you as his friend? He calls you brother when he needs you, but he thinks you are just a jerk.