Although cigarillo means nothing more nor less than "small cigar", I believe most people differentiate between "small cigars" and cigarillos.
The Ashton cigarillois a cigarillo, the Verocu is a cigar, albeit a small cigar (which as stated, strictly speaking is a cigarillo, but I'm going to argue not).
Tatuaje does not sell the Verocu as a cigarillo, so I don't think we should think of it as a cigarillo.
There is a point where it becomes pretty close to call, but once the ring gauge is 40 or more, to me at least, it is not a cigarillo.
First, to me cigarillos are smaller than 30 ring gauge. Some quiffling is going to occur at 32-34, but there's got to be a cut-off somewhere. The aforementioned Ashtons, Davidoff, Perdomo minis, RyJ Juietas and many more ranging from 20-28 ring gauge and often called minis or indeed cigarillos are what I thinkof as cigarillos. Ever do the European dry cured? Some very decent cigarillos there including Schimmelpennick. Even that company's Duet line, at 5.5 x 27 is marketed not as cigarillos but as panatelas. Anyway, dry-cured cigarillos can be very tasty little smokes.
The small cigars mentioned above are at that difficult cusp, are they or aren't they? The Papas Fritas are 4.5 x 44 - that's a cigar, a short cigar but certainly a cigar known as a petite corona or coronita. The Bolos and the Bolivar, around 5 inches and 35/36 are a hard call for me - they are large cigarillos that one will not smoke in 10 minutes. I think of them as short panatelas.
perelman's Cigar Cyclopedia classifies "cigarillos" as cigars less than 29 ring gauge (even smaller than my cut-off).
So what do you think? Plainly some think of short coronas as cigarillos. How big can a cigarillo be before it is a cigar; y converso, how small must a cigar be before it is a cigarillo? Let's define some terms.