Anime joke only Filipinos can understand

lmao
me too, I'm also bad at math

in math I am deku because I always know deku

In Japan, deku means dummy, as if a doll. It also means stupid.
...

Oh

Lol that's not what it means

I used Deku instead of "'di ko." which is short for "hindi ko" which means "I don't"

So it actually means

"In math, I'm always Deku because I always don't know."

Oh