Here it is. Your brain cells will thank you.
I went frame-by-frame to get most of the facial expressions, then went frame-by-frame again to sequence them right. Oof.
I made it in Firefox and found the lipsyncing to be off in Chrome for me, but your mileage may vary.

bump bump, suh-ah-say-ee

bump bump, tha-uh nos-uh

bump bump, let me show you how to scratch it

teh-put-tehteh, bump, suh-uh-puh-uh-tmm-peh-eh-tuh-pah-uh-pp-eh-tuh-uh-bump

Hi I’m verberse beatboxer from outer space

Lemme show you how springlocks didnt fail
https://scratch.mit.edu/projects/398424457/

BMFAFETTYFETTYBMBM DON- DON'T STOP
BMFETTYBM DON'T BMFWHA BMBMFHWAFETTYFETTYBMBM DO DON'T STOP BMFETTYBM DON'T BM PFT
Ya’ll gone (pft) make me act a fool, (pft) up in here, (pft) up in here! (pft)
Ya’ll gone (pft) make me loose my (pft) cool, up in here, (pft) up in here! (pft)
Ya’ll gone make (pft) me bust a (pft) smack, up in here, (pft) up in here! (pft)
Ya’ll gone make (pft) my fingers snap, (pft) up in here, (pft) up in here! (pft)
Why should I battle a crusty old man
When you can’t even defeat a little weak Peter Pan
Ya lucky this is (pft) only a beatbox (pft) battle
Cause in a real battle (pft) I make ya feel rattled
Look at him, (pft) he only got one planet, (pft)
I got the whole Galaxy (pft) under my dependence, (pft)
You’re gonna beg (pft) when you bleed and die, (pft)
As you realize (pft) destiny arrived
Ya’ll gone (pft) make me AHBRTT AHGHHBABEBETAEBFHGAHFHBRTHBRTTTBRTTT
Ya’ll gone (pft) make me AHBRTT ABHTETETFBEBATEABTGTEHUAHBRHTBRHT
Ya’ll gone (pft) make me AHBHEHH BHRBHBAUTBAHBAUHBRHBRTTBRTT
Ya’ll gone (pft) make me AHBRTT SSAHBEHBEBTBSSHFBETHUFDHAHDBHTBHTT
BMFAFETTYFETTYBMBM DON- DON'T STOP
BMFETTYBM DON- BMFAPFTDAH
BMFAFETTYFETTYBMBM DON- DON'T STOP BMH
LET ME SHOW YOU HOW TO SCRATCH IT
BMFABETEHETHETETBETBEBATBEBABETBMFABETATAHETETBETGABETEBBTEABTHABHRTBHRTHEHAHBMBETTBABTBETAEBTETBHTEHABHETAHETABM
Either way, destiny still arrives
BEEHYUHMM

when green flag clicked
repeat (20)
play sound [Verbalase Thanos Beatbox v] until done
turn cw (170) degrees
wait (10) secs

end

lol idk why i did this and why he is turning

scarch porjecs