A ticked, or agouti coat is one where each individual hair has more than one (ideally at least 3) colours on it. Smidgens are white at the base, with a little ginger and then black at the tip. It is the original colour of wild cats, and usually occurs in most tabbies ... abyssinians, being close to the original Egyptian cat, are the most noted for this characteristic but it can occur in any strain of moggy as well.
Edited to add that this is not actually smidgen but his little sister - I just noticed the black spot on her nose - but all the litter, male and female, were tri-colours