Crotchless, hacky sack, and POSSLQ

internet, v. This verb originally was used to mean to hook up one or more computers in a network. By the mid-1990s, however, the primary sense had changed to mean to connect to the worldwide internet.

I’m pretty sure I’ve never heard or read anyone using internet as a verb ("Where’s Billy?” “Oh, he’s internetting"); am I just out of it, or is this a very rare usage?

The verb surprised me too, lh, I don’t recall running across it before. Here are the OED cites.

[1968 IEEE Conf. Proc. 178 Almost all records that describe individuals‥may be expected to be automated in the future. First, by centralized computers‥and eventually by internetted computer systems with access from a large number of remote terminals.]
1978 Aviation Week & Space Technol. (Nexis) 17 July 82 Ability to internet.
1984 Defense Electronics Sept. 50 Repeated tests have demonstrated Roland’s lethality and ability to internet with other short-range air defense units.
1986 Defense Electronics Apr. 63 The TDRS system is used to internet the space shuttle and other satellites with their Earth-based control centers.
1994 Globe & Mail (Toronto) 13 May c10/3 A number of providers want you to Internet to their services.
1999 Guardian 6 Mar. (Weekend Suppl.) 67/2 Their bedroom then resembles something from a Ridley Scott film, where they sit, night after night, internetting with friends in Solihull their parents would strongly disapprove of.

I’m pretty sure I’ve never heard or read anyone using internet as a verb ("Where’s Billy?” “Oh, he’s internetting"); am I just out of it, or is this a very rare usage?

Brand new to me, too.

I’ve run across it plenty. It’s not terribly common, but not particularly rare either.

But on thinking further, it may have been especially common in commercial writing in the 1990s—marketing departments of various companies using it in their promotional material when the internet was the coolest, latest thing.