“Don’t give me any of that malarkey!” would be a proper use of the word malarkey, and how we often hear it in conversation. Malarkey is a real word, not a colloquialism, slang, or a non-standard word. The meaning is often grasped, even if one does not know the exact definition.
Malarkey, a noun, means nonsense or a meaningless, pointless, or irrelevant discussion.
“John’s explanation of his parking ticket was absolutely malarkey.”
“The discussion about space aliens was obviously pure malarkey.”
Hisself is not a word, or at least not a real word outside of slang expressions. It is an improper contraction of the words Him and Self. We guess that out there somewhere someone has used the non-word herself as a contraction for Her and Self. Slang yes, but they almost never make it into print other than when used in a quotation.
It is cringeworthy when you hear someone use it in conversation.