And no mistake
Definition 1 of 1
Pro Tip 1/3British Emphasis
Primarily used in the UK to emphasize the truth of a statement with a sense of certainty. 
She's the best in the class, and no mistake!
Pro Tip 2/3Strong Agreement
Use it when you strongly agree with what's been said or to reinforce someone else's opinion. 
That was a fantastic performance, and no mistake!
Pro Tip 3/3Colloquial Tone
Appropriate in conversational settings; may be too informal for academic or professional writing. 
We're in a bit of a pickle, and no mistake!