Top definition
A father, who does not believe anything you tell him. The most common example of this is not believing logic, science or not believing proven science or logic or anything else for that matter.
This is a Example of Idiot Father Syndrome.

(Father with IFS) Don't drip water on the carpet, it will stain.
(Child) No it won't, its just water it will evaporate.
(Father with IFS) It evaporates in your dreams!
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