"On Donda" is a phrase that means to tell the absolute
truth/swear with conviction; an Oath.
Origin: Donda is Kanye West's mother who passed away. In one of his tweets he used the phrase "on Donda", swearing on his dead mother, that Travis Scott will not allow
Drake to
diss him on any of future songs they create.
1- I'm about to quit drinking on
Donda.
2- On Donda, if you don't pay me tomorrow, we
fighting.