じわる(jiwaru)

Jiwa= jiwa jiwa means gradually.
ru= suru/kuru

So, jiwaru is to understand gradually.
If you understand a joke after a while ,then you can say "that joke is jiwaru".

おしゃかわ（oshakawa)

osya=oshare means fashionable
kawa=kawaii means cute

So おしゃかわ is fashionable and cute.
e.g. That shop looks oshakawa.

推し(oshi)

~oshi=favorite

There are many idol groups in Japan.
And people use this word for favorite person or character in the group.

e.g. My Oshi is ~~ in this group.

タピる(tapiru)

tapi=tapioka drink(bubble drink) ru=~suru(Japanese "do")

Recently there is a huge boom in tapioca drinks in Japan.
So people use this word to say "I will drink bubble tea," or "I'm drinking bubble tea."

ワンチャン（wan chan)

wan=one, chan=chance

So this sounds like "I can get one more chance".
But usually people use this word like "maybe".

"wan chan" You can win.
You might win.