Top definition
The ultimate negative description and insult of the late 60s and early 70s, man!
The court hereby sentences you to 30 days in the county jail.
Aw, that just ain't cool, man!

Get the hell off my ranch, you chicken thief!
You just ain't cool, you dig?
by Downstrike October 16, 2004
Get the mug
Get a just ain't cool mug for your daughter-in-law Zora.
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
Get the mug
Get a onosecond mug for your father Manafort.