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1.
The horrible moment when you realise that you have accidentally done something very slightly wrong which has very bad (usually embarassing) implications for you. This is typically the moment of realisation that you just sent a dirty text message to a close member of family, typically your mother, rather than the intended recipient.
Message: "i'm free this afternoon so come over and fuck me senseless, my parents will be out all day"
Recipient: Mum
Message Sent
- Onosecond occurs here -
by Jimmed September 26, 2006
 
2.
This occurs when you're at a party with all the cool kids and a second too late you realise you've accidentally put on a Yoko Ono solo record. Rapidly followed by you being shown the door and asked to never come back.
- CD starts -
Yoko (+ some freaky weird-ass music): Eeiiiiiee yeuuu oOeee ieiiei olaoolaaaolo
- Onosecond happens right here -
by ChillTheHill April 11, 2010