This is pretty cool. A few terms that immediately came to mind but are missing from this list as of right now are "network effects", "lifecycle email", "CPM", and "angel". Not strictly startup related, or even all that obscure, but there are a lot of not-strictly-startup-related-not-really-obscure terms on the list already (API, AWS, cloud, NDA, churn rate, etc.)
Looks promising. It would be interesting to know a little bit about the history of the term. For example, the Alligator Arms one still doesn't make sense to me. So in addition to using them in a sentence, perhaps a little bit about why they mean that.
It looks good and works well. It's a nice touch that the user is informed that a search term is not in the database but that the organizers have been alerted about the term.