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.
Jake's abs seem to be ready. Is his jaw?