^^I've actually heard it before. There's our grammar lesson for the day! heehee!
From dictionary.com:
flum·mox![]()
(flŭm'əks) Pronunciation Key
tr.v. flum·moxed, flum·mox·ing, flum·mox·es Informal
To confuse; perplex.
Woohoo, I even used it correctly! *L* Yay for me.