Scratches are incredibly popular in beatboxing. This scratch in particular is fantastic for combining with beats!

To make the sound

1 - Whisper the word "chewy"
2 - That's... pretty much it. Also try the words "chew", "cheery", and "che-chewy"
3 - To put into a beat easily, use the scratch to replace hi-hats

Peace, love, and forty times before swallowing

-FT