Mogging is vocabulary from the incel-community whcih has unfortunately become mainstream. As with so much other incel garbage (like x-maxxing and x-pilling).

EDIT: Around 16 years ago I was very much into bodybuilding and fitness, and spent a lot of time on the bodybuilding misc forum. Around that time the incel community started to take shape, and you had forums like PUA hate and other dark corners of the internet. These people were also very active on the bodybuilding forums, and would try to steer users over to the incel communities (interesting note: These communities started out as a place where unsuccessful men could vent over having spent money on pick-up artists, without any results).

Those places had a very distinct lingo, which is the very same that you see today with mogging / maxxing / pilling / etc. They even had a glossary.

Were those words older than those communities? Yes, very much so. But they've been completely hi-jacked, and any modern usage comes from those communities.