why do 2k youtuber say horse to a good rebounder?

i seriously dont get it. i know the 2k youtubers are 90% kim kardashian level retards, who yell everything out of their brainless mind, but still can somebody explain?

EDIT: Just found this: https://s3-eu-west-1.amazonaws.com/assets.barcroft.tv/4b8a608c-6032-4321-8e0f-7a7ef3abb87c.jpg