Can someone please explain to me how one would fake the funk on a nasty dunk?:

From urbandictionary - Fake the Funk: (v.) To act with a false ethos surrounding oneself in an attempt to win respect from a certain influential party.

In layman's terms, it's an act similar to being someone you're not just to impress others.

In the great realm of basketball (one that is riddled with questionable catchy phrases), we can only conclude that faking the funk on a nasty dunk would be something similar to going up with a dunk that is not representative of your own character. As one scholar describes, "Faking the funk is exuding a bravado that is not commensurate with your qualifications."

We turn, then, to the inherent problem: how one can fake the funk on a "nasty dunk". As I'm sure the majority of this audience knows, a nasty dunk is not one that is noxious or unpleasant - interestingly, this fits one of the classical definitions of irony: the use of a word to convey a meaning that is the opposite of its literal meaning.

So the problem lies, of course, that a "nasty dunk" would inherently contain a certain level of funk. To imply that someone is able to fake the funk on a nasty dunk is, in its sense, someone that is performing a great dunk that is out of character. Used in example - Tim Duncan performing a "Honey Dip" dunk immortalized by Vince Carter from the 2000 Slam Dunk Contest. The "Honey Dip" is a "nasty dunk" but one that is out of character for the stoic Timothy Theodore Duncan.

TL;DR: it means Bill Walton should stop doing windmills