hai guise 

Literally a phrase that everyone has used at some point in their life and nobody knows why or where it came from.

Hai guise, how is yur days going

hai guise by Chris Leelum May 6, 2016

hai guise 

Oh hai guise! Or: Hai guise! is basically a Internet-slang/channey way of saying Hi guys! It's used a lot in Internet memes. (I don't know the exact origins so this definition basically needs modification.)

Oh hai guise! (Picture of a cat)

hai guise by Den Den Den July 11, 2016