A third party program that sucks your blood to protect your PC for your irresponsible behaviour like downloading torrents and shit from dubious places on the internet.
Person 1 - I think I downloaded a virus from ehentai?
Person 2 - Yeah I got an antivirus for that.
A virus that imitates real security software and "scans" your computer, giving bogus viruses in an attempt to scare you into giving them your credit card number.
Antivirus plus? What's that? Oh no! 32 threats found? Malicious software detected? Here's my credit cardnumber! Charge me any amount you'd like!
A malicious software program that tries to butt fuck you by automatically downloading on your system and tries to make you believe that you have multiple infections and and tries to make you fork over your credit card information to have your PC "cleaned" of all these non existant viruses. Usually found on porn sites
YOU: tittys... spanking... foot worship... other freaky shit... wait i didnt want this Antivirus GT... WTF?!?!? 30 VIRUSES!?!?! HOLY SHIT I WATCH TOO MUCH PORN