A combination of "apostrophe" and "fuck". Used when someone uses the wrong form of your/you're, the wrong form of their/they're, use an apostrophe for a plural word, or don't use one for a possessive word.
Basically any self-absorbed, closed-minded STEM person thinking that they're all-mighty and better than anybody else just because of what they chose to pursue. "Astro" coming from astrophysics. Often see people in any other fields (especially creative ones) as lesser beings. They are the douches of the modern era.
Astrofucker: What?! You chose to do lower level mathematics? What a pleb!
(noun/verb) An event in an person's life where a ridiculously awesome fucking took place. An astrofuck typically occurs when all partners involved would admit that that particular fucking was their best yet. As a rule, you cannot use this word after your first time.
A person who frequently comments on the poor grammar of others.
Someone with an overt affection for the correct usage of English, and feels compelled to share this with others
Synonym of grammar nazi
Stop being such an apostrafucker John, so what what if I used who instead of whom!