Top Definition
A motherfucking typhoon that destroys and ruins everything and everyone.

Poured down the rain equivalent of a month, in SIX FUCKING HOURS.

Made floods as shitass high as your house, and left everyone standing on their roof, while waiting hopelessly for rescuers to 'save' them.
Guy 1: Did you go swimming today?
Guy 2: YES. I SWAM IN A 6 FOOT POOL CALLED FLOOD. FUCKING ONDOY.
by tadaa_ishness September 26, 2009
Philippine English term for "internet flooding".... Commonly used in chat sites, ustream and other social networking sites
Byrus: Hello
Garena: What are you doin' ?
Byrus: Hello
Marky09: What's going on'?
Byrus: Hello
Degenatron: Hey, stop ondoying!
by PinoyChatter October 13, 2010

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