Often used when regarding something similar to that of ‘stupid’ .However it can be used in many differentcircumstances and is highly based on the context it’s used in
Generally something of notable annoyance or irritability is described as ‘shmum’, however the word is a versatile one and can be used in many contexts as a positive or negative.
Shmum is a word that can almost mean anything but is often used instead of stupid or other insults. It can be good or bad depending on the tone of voice.
Your shmum for that mate. -bad
Bro ur mum is stupendously shmum- good