L.A. Rams cornerback Marcus Peters got so pissed off at a heckler in the crowd during Sunday night's game against the Eagles ... he went into the stands and cussed the guy out.
It's crazy.
Peters was on the sideline while Philadelphia was beating the Rams, when Peters heard someone in the stands talking trash ... so, he talked back.
"Where you from? Where you from, homie?" Peters said as he walked into the stands.
Peters got right in the guy's face and the talk turned even tougher -- "Square ass n**ga.