站着说话不腰疼

站着说话不腰疼:

Literally means:

one does not feel the backpain by just standing idle; it's easy for the uninvolved person to say like that

Actually means:

It figuratively means it is easy for one to brag or to make irresponsible and sarcastic remarks, which is of no help to the problem. It is usually used to retort such remarks. Derogatory.

比喻说大话、风凉话很轻松，要怎么说就怎么说，但是没有用。常用于反驳说风凉话的人。具有贬义色彩。