When you have a massive night but don't have any fun, and wake up with a hangover and poor life choices.
'I seriously shouldn't have gone out last night. What a waste of $200. Serious RONMO about it guys.'
by Meliss777 September 01, 2013
regret of not missing out: opposite of fear of missing out (fomo); when you participate in something expecting it to be fun but it just ends up being boring or lame.
by JohnWick666 February 16, 2025