"Pulling a Sam O' Nella" refers to the act of suddenly disappearing for quite a long amount of time and then suddenly reappearing. This phrase was formed as a satirical homage to the Youtuber 'Sam O' Nella' as he suddenly stopped uploading/disappeared in January of 2020, then reappeared suddenly without a warning in October of 2022.
Q: Yo sorry for pulling a Sam O' Nella, I was busy on the weekend.
A: It's aight bro.
YNTKTS Is an Indonesian acronym of "Yah ndak tahu, kok tanya saya" roughly translating to "I don't know, why even ask me". It was popularized by Indonesian President Joko Widodo when he said it during a press conference. "YNTKTS" is often used by Indonesian "netizen" kind of like how we use the acronym "idk".
Alex: Dude where are my keys
Mark: YNTKTS