onum 

onum-on ur mom

-bro did you tell her?
-yea bro
-onum?
-yes bro

onum by serelle June 5, 2022

ONUMB 

The slang name for the Ohio Northern University Marching Band.

Jack: Are you doing ONUMB next year?

John: Yes, I love marching band!

ONUMB by tbsonumb December 17, 2008

onuma 

Synonym for enema

I just had a cracking onuma with the lads today!

onuma by Gandhicam November 5, 2018