Jake Paul Gets Drilled In the Stomach, Punch Me Harder!!!

Jake Paul can multitask -- here he is threatening to "f**k up" Deji ... while some dude repeatedly punches him in the stomach!

Jake and Deji are just 5 days away from their boxing match in England -- an event that some say could have more viewers than Mayweather vs. McGregor.

The main event features Jake and Deji's older brothers -- Logan Paul vs. KSI -- two YouTube stars who both claim they're using this fight as a step toward becoming pro fighters.

As for Jake and Deji -- no pro aspirations here ... these guys just hate each other.