Top Definition
Basically shortened for 'on the sly' basically a way of describing somebody doing what ever slyly or by doing something quite cool.
Popular around the north west of England

*Guy kicks a football*

'ahh look at him kicking that ball ont sly'

*guy sneaks into room'

'Look its joe ont sly'
by KyleMc March 26, 2008

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt