Is this English sentence correct?

[Jake]

"The seasoning will infuse the meat and won't fall of whilst you fry it."
And is whilst more conventional at all?

[Marvelous Marv]

I'd say: "... won't fall off why frying".

[176]

Nobody uses "whilst" in regular conversation in 2014. You would simply say "while".

[woerden]

Yeah, this whole "whilst" thing is very popular on the Internet nowadays, but not in normal, everyday conversation (in North America, anyway). (I noticed it beginning a year or so ago, on facebook and other social media sites...usually in the caption of a picture or video.) "Whilst" isn't wrong, but it's weird. Some dictionaries even say the word is obsolete, like "thou". Just use "while" if it's a conversation between Americans or Canadians.

"The seasoning will infuse the meat and won't fall off while you fry it," or "...while you're frying it."

[Randy P]

"Whilst" sounds strange to us in the US (and Canada too perhaps). But I've heard English people say it in conversation plenty of times. So I wouldn't completely believe the statements that "it sounds weird" or "nobody says that anymore". Nobody says it on THIS side of the Atlantic.

[PizzaMan(8)]

fall off* - 'off' has two Fs and means the opposite of 'on', 'of' is a different word.

'while', as other people have said, is more conventionally spoken than 'whilst'.