Stands for 8 and 6 in japanese (86). In a automotive context, it relates to the Corolla AE-86 hatchback, which is famous for it's drifting and racing capabilities, and referred by the YouTuber from the channel Bladed Angel in a funny way as the "Eight-uh-Six-uh", in an attempt to sound like a japanese man.

Hachy is short for “Hachinpa” which is short for “100%”. You typically use this word after someone says something that doesn’t sound credible.