when someone is trying to explain smth to you but you don't understand, so they give up cuz they are done with you
person: hey do you wanna go to that concert?
person1: concert? whos? when ?
person: taylor swift. tomorrow.
person1: oh but I have a project due tmrw and I think I can adjust but--(bla blah blah)
person: nm, I should have stfu
person1: concert? whos? when ?
person: taylor swift. tomorrow.
person1: oh but I have a project due tmrw and I think I can adjust but--(bla blah blah)
person: nm, I should have stfu
by myeongli December 5, 2021
Get the nm, i should have stfumug. STFU, (shut the fuck up), is a word commonly used in texting and online chatting systems. It is to tell a person to be quiet and don't talk because your tired of them.
Although Kevin is usually funny, he made a very bad and offensive joke, and his friends told him to STFU.
by jacktheripperishere677 February 16, 2022
Get the STFUmug. by zariaxlover March 7, 2020
Get the stfumug. 
this is a very interesting event where instead of boring everyone with you annoyingness you just shut the f*ck up (stfu)
by buenos noches June 2, 2021
Get the stfumug. 