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WWE Superstar Titus O'Neil made friends with a homeless man on the streets of L.A. Saturday night ... and now, they're bffs.

O'Neil had some leftover food from dinner ... and decided to hit the streets around his hotel to find a homeless person -- when he ran into John from Detroit.

Titus says, "What was supposed to be a quick encounter turned into a few hours of learning and laughter with a complete stranger."

The 37-year-old wrestler introduced John to other wrestlers in town for Sunday's SummerSlam ... and hung out with him in the hotel.