NFL's Darnell Dockett -- SUBWAY IS DEAD TO ME ... Because Of Jared Fogle

Darnell Dockett's days of the five dollar foot long are over ... 'cause the San Francisco 49ers star says he's so disgusted by the Jared Fogle scandal he's never touching Subway again.

As TMZ previously reported ... Fogle -- Subway's go-to pitch man for the last 15 years -- has been charged with traveling to engage in illicit sexual conduct with minors and has struck a plea deal with prosecutors.

The controversy is obviously too much for Dockett's appetite ... 'cause he just announced he's changing his fast food alliance forever.

"Mann ain't no Sub way sandwich bih... Jared being trifling with kids. No I won't ever eat sun way again.. I'll just eat @wingstop instead!"