Soulja Boy heard Aaron Carter call him out loud and clear ... firing back at the pop star with some fighting words of his own ... saying, "I'll beat the candy out his pockets!!"
But it isn't just talk ... TMZ Sports has learned there is a legit offer on the table for both guys to step in the ring and duke it out!!
Of course, the "That's How I Beat Shaq" crooner told us last week he'd be down to step in the ring again .