A "Flying Surf" is when you accidentally combine two words into a new word.
Origin Story:
I was playing CS:GO 'Surf' and talking about the YouTuber 'Flying Uwe'
so while talking i said by accident 'Flying Surf' instead of 'Flying Uwe'
A: Did you saw the new Ryan Reynolds movie ?
B: The one with the Red Suit ?
A: Yeah, Red Reynolds was amazing.
B: Red Reynolds ?