The kind of shit you do on a daily basis that leads you to finding this definition in the first place. It usually involves an action that can be described as completely frivolous and fucking retarded, or to the common man, stupid shit. It can also be used to describe someone who is equally fucking retarded and needs confirmation that the party isn't starting at 6 AM when someone tells them it starts at 6:00. A better term to call someone in this case is "obtuse dunderfuck".
"Hey I'm gonna go out tonight and vandalize the school! Wanna come with me?"
"No fuckass, I'm not doing any dumb shit like that."
"No fuckass, I'm not doing any dumb shit like that."
by inscrutable_Idiot August 16, 2019
Get the Dumb Shitmug. by Danforth November 7, 2018
Get the Dumb Bitchmug. 
Someone who doesn't watch 'Avatar: The last air bender' even when you tell them to, and always reply with a 'Lord of the Rings' based suggestion.
by watchavataryouprick! August 18, 2017
Get the Dumb cuntmug. When you put the word "dumb", meaning dumb and "bitch" meaning bitch, you get dumb bitch. Dumb bitch
by The whippus April 15, 2021
Get the Dumb bitchmug.