ive been playin a lil more the past 2 days, and ive gotten a little pop up saying:
"Zombie Slayer" 10 AP
"Baby, you're a rich man" 20 AP
"Quester" 10 AP
"Evil Crate" 20 AP
what is this and what does it do?

Those are achivements that you finished. If you hit j you can see all of them.

Press "J' and look.

what do they do? just show certain things you've done?

yes, and maybe in the future you may buy or trade them into somthing. Thats the rumours iv heard

ah cool.

thats no rumours, it has been announced since release that you will be able to do something with the points you get. anyway no official statement yet on what you actually will be able to do with em.