What it means
Ong, short for on god, is sworn emphasis to insist you are dead serious or telling the absolute truth: ong, that actually happened. The verbal hand-on-heart of total sincerity.
Usage examples
"Ong, I waited two hours and they never showed."
"This is the best burger in town, ong."
"Ong I left my phone on the bus and just stood there sick."
"You ate the whole box by yourself, ong?"
Where it comes from
Ong is just the clipped text form of on God. It took off in online chat and Black American slang as a fast way to swear you're telling the truth or that you mean what you said with full chest. Same promise, shorter keyboard sprint.
Other ways to say it
Editors of this term
Shiny-Button Alchemist Official watcher of this expression
Tell me, what have you got for me?