From Usenet + -y.
Usenetty (comparative more Usenetty, superlative most Usenetty)
- (Internet) Relating to or characteristic of Usenet.
1996 October 1, Bryan Lambert, “The many categories of RATTM”, in rec.arts.tv.mst3k.misc[1] (Usenet):I tend to think of RATMM as "kicking it old-school" as far as online groups go. It's not very Usenetty. It's an actual community, unlike just about every other newsgroup I've been on.