The Brief: The response "jail" or "straight to jail" on social media is typically used in reference to something that is considered to be bizarre, ridiculous, or gross.

DEEP DIVE
The response “jail” or “straight to jail” on social media is typically used in response to something that is considered to be ridiculous, silly, or gross. It is meant to be funny and implies what the individual responding just saw should be considered illegal.
Variations of the phrase “jail” or “straight to jail” often refer to some form of the prison system. Phrases include: “death penalty,” “out of my courtroom,” “prison,” etc.
There is also the phrase “Right to jail” which is sometimes used to refer to a line out of the show Parks and Recreation.
https://twitter.com/inkverywell/status/1354970246117875719?s=20
This response is typically found pertaining to bizarre cooking videos online.
High crimes and misdemeanors. Straight to jail, straight away https://t.co/2umCDPN8dO
— Shadow of the Kellossus (@Im_KElling_It) December 13, 2020
JAIL😭😭😭😭😭 pic.twitter.com/lDqvtHNNa2
— lily (@herojosfft) January 29, 2021
if you simp for someone you met on twidder dot com, you are going straight to jail
— betsy 🌿 (@80soverstreet) January 28, 2021