I think you are talking about Brock Lesnar. He matches all the descriptions you provide.
Very close, only bigger and much louder
Is he someone from WWE?
No, its just my made up persona... I am a big UFC fan
Oh, do he participate in any other activities?
professional arm wrestling but mainly MMA
Is it Dave Bautista. he matches it perfectly.He is a professional fighter, MMA contender, Who also conmpeted in WWE.
Yes, you got it, I'm pretty much him and a brock lesner hybrid... Do you watch UFC?
Am not much of a wrestling fan. I dont watch UFC. 
I gotcha, you just happened to know brock lesner and betista because they are big names (and guys)
yes, i recently saw the movie trailer army of the dead directed by Zack. Bautista plays one of the lead roles. 
Yes, that actually looks cool. I am a fan of Zack Snider... Please respond faster so we can get this over with
Have you watched Snyder Cut? I loved the movie, especially the details
Yes!!! So much better then the theatrical release
Yes, it was worth than the one released in theatres.