look up any word, like swag:
 
1.
From the North West, meaning 'i understand', 'i know what you mean' etc
'yeah am onto it' 'onto' for short
by ARMS March 28, 2005
 
2.
aware of especially something dishonest or unlawful
I think he's on to something.
by The Return of Light Joker April 14, 2009