Canadian Nibble

when you offer someone a BITE or Sip of something and they go ahead and eat/drink the entire thing

Hey want a bite of my ice cream?
Sure - eats the entire thing
I didn't mean a Canadian nibble

or

Want a sip of my drink?
Sure - drinks it all
Wow way to take a Canadian Nibble

or

the response from the person who take the Canadian Nibble can be "Thanks for the Canadian Nibble"