A contraction of the words "shut" and "up." Pronounced "Shuh-up!" Usually said by short chubby women or especially bitchy people.
by Kyothine April 22, 2009
Get the Shu'upmug.
Get the Shu'upmug. by Monkey Whisperer November 1, 2020
Get the Oy bruv, shu'upmug. 