Happy Doodles 

A term first coined by a mathematics teacher in Hwa Chong Institution which soon became a meme among students. General definition is "understand?". Often used responded with sad rice.

1+2 is 3. Happy doodles?
Happy doodles? Sad rice!

Happy Doodles by Potsto March 10, 2021

doodle happy 

Doodle happy is to be doodling and get carried away.

Oh, who got doodle happy over here, look at the wall!

doodle happy by Lucy-fer in the sky with diamonds August 19, 2004