Green’s Dictionary of Slang

a term of emotional resignation: fuck it, drive on.

1983		Eble Campus Sl. Nov. 2: fido – Fuck it. Drive on.
1997–2000		College Sl. Research Project (Cal. State Poly. Uni., Pomona) 🌐 FIDO (int.) An acronym for F*** It, Drive On – a term of emotional resignation, getting past some set back or the like.