system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is it that when I see or hear about something for the first time, I start seeing more and more of it

Let's say I'm out in the park and I see a guy driving a Fiat, for the rest of the week, I just see more and more Fiats wherever I go. The other day I found out what a "Dinges" is, then I saw a commercial on TV where Tina Fey shouted "Dinges for everybody!", I then noticed a waffle stand that had Dinges on the menu. I've noticed this phenomenon for years, but I simply don't get it.
gpt
The Baader-Meinhof phenomenon mentioned in another post is part of it, but another part of it is mass media.  One of your specific examples is a TV show.  If a TV show uses an uncommon word and a million people watch it, at least some of them are going to use that word again the next day, and it perpetuates.  

What made you go find out what a "Dinges" is? maybe you saw the commercial and forgot it, or maybe someone else saw the commercial and used the word in casual conversation.