This is what is posted at the Twitter site:
(vl-list->string(mapcar'(lambda(x)(boole 6 95 x))(vl-string->list"\023:+x,\177+(::+\177,02:\177\023\026\014\017\17790-\1779*1~")))
What Kerry is saying is be sure you remove any malicious code before executing it. In his example the (eval (read are potentially dangerous.
So before you paste any code you do not know what it does you better figure it out first.