Definition : SUM/SYM : To not speak when its not required; when you have nothing to contribute productively, you should SYM/SUM and not talk for the sake of talking.
SUM means to ask someone to shut up when they have inappropriate things to say
SUM means to ask someone to shut up when they have inappropriate things to say
by crazy cuckoos October 26, 2020
Get the SUM/SYMmug.