Well . . . Let's start off by saying that for legal advise, see an Attorney. I am not your Attorney, I don't look like your Attorney, I don't smell like your Attorney, I don't even play an Attorney on TV.
Florida State Statute (hence forth known as FSS) does specifically specify "Self-propelled knives, unlawful to manufacture, sell or possess" under FSS 790.225. But that was not your question.
Under FSS 790.001(13), a "weapon" means any dirk, metallic knuckles, slugshot, billie, tear gas gun, chemical weapon or device, or other deadly weapon except firearms or a common pocketknife.
FSS 790.10 Improper exhibition of dangerous weapons or firearms. If any person having or carrying any dirk, sword, sword cane, firearm, electric weapon or device, or other weapon shall, in the presence of one or more persons, exhibit the same in a rude, careless, angry, or threatening manner, not in necessary self-defense, the person so offending shall be guilty of a misdemeanor of the first degree.
I'll paraphrase FSS 790.17. Thou shalt not provide anything (other then a common pocket knife) to a minor under 18 years of age without parental consent. Misdemeanor, first degree.
FSS 790.18 Sale or transfer of arms to minors by dealers. It is unlawful for any dealer in arms to sell or transfer to a minor any forearms, pistol, Springfield rifle or other repeating rifle, bowie knife or dirk knife, brass knuckles, slungshot, or electric weapon or device. Second degree felony.
Personally, I would spend the $117 and get a CCW permit if I were you. Think of it as cheap "Life Insurance". Plus the permit is good for five years now.
FSS 790.06 License to carry concealed weapon or firearm. Subsection (1) specifies: For the purposes of this section, concealed weapons or concealed firearms are defined as a handgun, electric weapon or device, tear gas gun, knife or billie, but the term does not include a machine gun as defined by FSS 790.001 (9).
This is also the section that allows CCW holder to carry autos in Florida. Basically there is nothing that specifically disallows autos in FSS and under 790.06, it gives blanket permission for permit holders to carry a "knife".
As for "What a Dirk?" In Webster's a Dirk is defined as a "straight-bladed dagger".
Hope this helps
John Hollister