It's when you take gasoline and cover ones genitals (more specifically) a penis. And then once it has been covered/drenched, you take a Match or a lighter and set the gasoline on fire.
John: Hey bro, this girl and I last night tried the Arizona spitfire!
Bill: nice! I bet it was hot!
John: it really was!
Bill: nice! I bet it was hot!
John: it really was!
by N.M.R.2.1.1.2 June 15, 2017