I don't use the "taboo" terminology, but I frequently ask people to operationalise their definitions in arguments. ("What specific steps would I go through to test whether the system is scalable or not?")

The first time I ask, people ignore it and/or don't understand it.

The second time I ask, people get uncomfortable because generally they haven't thought about what they mean to that level of detail, and they try to weasel out of it.

The third time I ask, it diverges. Some people give me a reasonable definition. Some people say "sorry that's not possible" and depending on the subject, I pause the argument at that point to do something else.