At my age I just assume anything I don't know is sexual.

It's clearly sexual from the context of the meme. Pretty much any time this happens, it's sexual in nature. Otherwise it would just be confusing rather than presented as humorous.

Nyeah... partly.

If that were entirely true, a "power bottom" would make no sense.

The terms sexual usage originated in gay circles where it only delineates who penetrates and who gets penetrated. Traditional views on sex ascribe a submissive or passive role to the bottom and an active or dominating role to the top, but you can totally have a power bottom who takes control and an active role in the intercourse but is the one getting penetrated.

She can pull three boners simultaneously

You shall rue this day apparently.

mistake

Mmmhmm, yup, yeah, wait...wut??

But as an old fucker, I don't know the current meaning.

Pleasantly surprised this site still works.