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The act of unzipping ones pants and smacking somone across the face with a flacid or erect penis.
Yo ass-hole if you don't shut the fuck up i'm gonna zip-smack you!

Yeah my bitch was talking back to me so... I zip-smacked her!
by BillC July 28, 2006
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Jul 12 Word of the Day
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
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