at its best 

Of or at the highest standard of quality possible.

You'll love their new album; it's simply jazz at its best.

at its best by MarshallM. February 12, 2017

stupidity at its best 

The maximum level of stupid 9000+

John tried to erase a pen mark.....STUPIDITY AT ITS BEST

stupidity at its best by Bronze 5 and still alive February 20, 2018

at it's best 

Used in the past (2007 - 2011) by children/9gagers/idiots but mostly foreigners that have no idea when to use this expression but still want to join the English internet meme-world.

child 1: Hey bro did you see this hot new meme ? Mario trolled luigi!
foreigner: ah ah ah, this nintendo at it's best !

at it's best by YouWereSupposedTo September 6, 2018