EDIT: nevermind you can do this with regular lua but not rbxlua
getmetatable("").__add = function(a,b)
return a..b
end
-> print("a" + "b")
<- ab
-- can do it with other operators as well!
getmetatable("").__mod = function(a,b)
return a..b
end
-> print("a" % "b")
<- ab