oniondunk 

A vagina with a bad odor, the odor of a vagina

That girl had some bad oniondunk

oniondunk by Seriphimarchangel March 31, 2009

onionzuka 

Shrek's main weapon. This was used to wipe out the fairy godmother.

(Onionzuka)

onionzuka by Danimehboy August 5, 2014

onionbunii 

The coolest artist/animator around! goes by kyu and onion

Person: yo have you seen the new onionbunii animation??

Person 2: yeah! it’s so cool!!

onionbunii by squiddddddy July 18, 2021