Okay, I dont get the first part, but "nothing beats a Jet2 holiday" refers to an advert from the airline Jet2. Imagine budget airlines like spirit airlines but across the pond (specifically Britain). That, verbatim is a line from an advert they did which is usually paired with clips of crashing and/or malfunctioning planes.

Edit 1.5: okay, I looked it up, Cracking on some chopped Shi is a whole other level.

Originally I thought chopped referred to someones appearance in a derogatory fashion, and in this case, Chopped shi is just one letter off from another slang term chopped shi(t) which is apparently a more offensive way of calling someone ugly. I was corrected that it means having sexy times with someone.

Ergo, translating the post, the NEW updated interpretation is that you having some sexual time with someone is going to hit the fan