I know for PhD programs in English one should expect full funding. How about for MAs? It seems there are a number of schools that offer it, but is this only for the top students they accept or is common? Also, what does “full funding” in grad school mean - full tuition, or can it also cover room and board?
full funding, which is usually only applicable for PhD programs , means tuition plus a stipend for
living expenses.
And for MA programs, if offered, it only goes to tip top students.
Full funding for an MA program in English is very uncommon.
I know that Wyoming offers a fully funded English MA: http://www.uwyo.edu/english/master-of-arts/. Worth looking around to see if their are any others 
Edit: Also, would like to hear from you guys about what Full-funding is, would help me with my post as well
Full funding is when a program covers your tuition and fees (including health insurance) and also gives you a living stipend that allows you to pay for rent, food, and miscellaneous/incidental expenses.
Not sure you’ll find many but I know that U of SC and probably others do offer graduate assistantships in areas that are open to all grad students in general areas of the university like housing. These were often advertised and usually were a stipend/salary plus some type of tuition reduction/waiver. You might find something like this. Ask the schools you are considering.
I’ll be starting my MA in composition/rhetoric (a subfield of English) in the fall and I received fully-funded MA offers (which included tuition waivers and stipends for teaching. This is what fully-funded usually entails). They’re out there at some of the better and more established programs, but I think it is more competitive (and I think some programs only offer funding to some MA students while admitting others without funding. It varies by institution, but I think it’s safe to say they more likely will fund their PhD students first). Anyone can feel free to pm me for a list of schools I got funded offers from.
I will say that the stipends aren’t as much as a PhD student can get. My lowest offer was $11,000, my highest just shy of $15,000, and then some in-between. PhD students can usually get around $20,000 (from what I researched), so MA offers definitely aren’t as high. Also, some schools won’t have MAs teach right away but might make you work in the writing center at first. Again, it varies.
There are some lists of fully-funded MA programs in English on grad cafe as well, which might help.
Good luck!