ONB
ONB has 2 meanings
On, bro
Example
I can't wait for summer
onb. it's gonna be lit
onb definition by Slang.net
This page explains what the acronym "onb" means. The various definitions, examples, and related terms listed above have been written and compiled by the Slang.net team.
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Onb is a messaging abbreviation for "on, bro" that people use to emphasize the truth of a statement or claim (think "on my life, bro"). For example, if your friend doubts your text about seeing Rhianna at a party, you might respond with, "It was her, onb! I'll send you a pic of the back of her head."
It is unclear who came up with the phrase "on, bro" and subsequent abbreviation, but it gained popularity in the late-2010s. As it has gained popularity, people often use onb when texting or messaging online, whether on social media or another platform. They use it similarly to no cap or ISTG.
People might also use onb to agree with something someone else said. In this way, they are confirming the truth of that person's statement, like when someone says, "bet" or "Amen, brotha."