This phrase is usually spoken by an older woman who knows next to nothing about computers, as would the phrase "windows machine". And it's not sexist of me to say that, because it's just a fact. There's nothing wrong with being an older woman.
Person: Let's see... it doesn't look like you have any means of connecting to the internet. No phone line, no cable modem, no wireless, nothing.
Older Woman: So?
Person: These things don't just happen on their own, woman.
*The Next Person Who Posts a Definition Here:*
Omfg Macinsuxors Computorz sukc asss!!!! never use em! i from da getto in odessa, texas!
--gayass mac machine did sssomthing bad