Many people use
(sp?) for (I don't know how to spell that word)

Julie Andrews sang, Supercalifragilisticexpialidocious (sp?), with great gusto.

So, why can't we use
(sp!) for (I am deliberately mispelling (sp!) this word

QUESTION

Is there actually a specific word that does mean deliberately misspelled?

I know that [sic] (usually [sic], sometimes (sic), but brackets are preferred)

is used to indicate that the word was misspelled in the source document