Flummox is defined as to confuse someone.
When you ask someone tough questions about a scientific theory that he is studying and he cannot understand the questions, this is an example of when you flummox.
Slang to confuse; perplex
Origin of flummoxfrom uncertain or unknown; perhaps
transitive verbflum·moxed, flum·mox·ing, flum·mox·es Informal
To confuse; perplex.
Origin of flummoxProbably of English dialectal origin