In the Hotwife lifestyle of the Wifesharing kinky sexual community (under the swingers' umbrella), a female "Bull/Buck", i.e. a female guest appearance in a Hotwifing (Stag/Vixen) couple's bedroom.
-Do you think Sergyle will ever let me fuck his wife, since they're in the lifestyle now?
-I don't think so, man. I'm pretty sure he'll only let her have Bullettes.
A tiny, low-impact software defect that is technically incorrect but practically inconsequential; too small to prioritize, too real to ignore completely. Every developer has left some behind to the irritation of users.