an abbreviation that consists of the first letters of each word in a phrase and is used when discussing a subject in a chat room or when writing an email

Netcronyms are a quick way of telling people what you think. 网络缩写词是一种迅速传达意思的手段。

IMO is a netcronym for "in my opinion". IMO 是 in my opinion 的网络缩写词。