NFL Star Keenan Allen Rips Le'Veon Bell's Rap, 'This Ain't It'

Le'Veon Bell innocently went to Twitter to ask his followers what he thought of his new song on Sunday ... and Keenan Allen did exactly that with a BRUTALLY honest response.

"I gotta keep it band bro. This ain’t it" (while adding a garbage can emoji).

DAMN!

The NY Jets star didn't take the public criticism lightly ... telling Allen to hit him up directly if that's how he really felt.

"if youu honestly felt that way, youu could’ve just txted me and said that," Bell responded, "but it seems even ppl with check marks wanna troll to seek attention for mentions now a days..."

"enjoy this buzz fuzz, it’s still all positive vibes."

Now, remember ... it's April Fools Day. So, is this all just a prank to get people all worked up?? The LA Chargers star's follow-up suggests otherwise.

"I was not trolling on my momma bro. I don’t troll. Like I said I speak facts. You shouldn’t have asked if you ain’t want the truth. All love over here bro"

So ... is Bell's song actually good or bad? We're just gonna post the video below and let you decide.