Jumjum is short-hand for food envy. It can also be used to berate someone who is taking too long to eat and talking too much.
It's a sudanese thing, apparently.
We treasure brevity here at the farms, so hurry up and swallow!
Bleatings and Exhortations, newfren!
I see that you're interested in the WeebWars drama! We've had many, many new users here interested in that topic, and like most new members, they're trash! Get yourself an avatar and hold while our doxing experts make sure your username is unique!