1) a notch that is the highest in a row or column of notches
2) slang. an item, person or idea that is so much better than everything else that it is ridiculous.
"Just hang that on the top notch"
"These cheese fries are top notch"
adj.
Good. Perfect. Untainted. Mint condition. Healthy.
Of something or somebody.
If a car salesman tells you the car is in top-notch shape, just kick him straight in the gonads.
Despite the cocktail of Anejo tequilla and cocaine, I feel in top-notch form this morning!
Not hard to understand, it means best, high standard achieved, very good, etc
They are top notch
adj.
Good. Perfect. Untainted. Mint condition. Healthy.
Of something or somebody.
If a car salesman tells you the car is in top notch shape, just kick him straight in the gonads.
Despite the cocktail of Anejo tequilla and cocaine, I feel in top notch form this morning!
The best something can be, there is no phrase in the world which emphasises the quality of an object/person/situation more than top notch.
Stuart: How was you're date with Lucinda-May?
Edgar: It was TOP NOTCH!
Stuart: Woah, that means that it was better than anything else ever?
Edgar: Yes, because that's what top notch means.
Best and better than the in competition. First used in 1848 when reffering to a lady friend. Notches in the bed post were used to keep a record of the women you slept with. If she was the top notch then she was the best in show.
That chick I went home with last night was "top notch."