What fairly odd parents episode is it where timmy's dad says gigagasp Egad?

The episode you're referring to is "The Big Problem!" from Season 2 of The Fairly OddParents. In this episode, Timmy's dad, Mr. Turner, humorously exclaims "gigagasp! Egad!" when he is shocked by Timmy's antics. This moment is a classic example of the show's comedic style, blending exaggerated expressions with the whimsical challenges Timmy faces.