usually people say it when they're bored or
can't think of
anything else to say or talk about(especially over
instant messages)
*it doesnt always have to be spelled 'uggg' there can be more 'g's*
screename1:hey
wats up?
screename2:hi
nm u?
screename1:
nm
...a couple minutes later of not talking...
screename2:uggg