Tmesis is a linguistic phenomenon or figure of speech in which a word is separated into two parts, with other words occurring between them.
“Congratu-fuckin’-lations”, in which an expletive or profanity is inserted
“La-dee-freakin’-da”, a variation of the above in which a less offensive infix is substituted.
“Earvin ‘Magic’ Johnson, Jr.”, in which a nickname is inserted between a first and last name.
“Wel-diddly-elcome”, a signature phrase of fictional character Ned Flanders’, where a nonsense word is inserted. Note the reduplication of part of the host word.
“Any-old-how”, in which the divisibility of “anything” (as in “any old thing”) is mimicked with the usually indivisible “anyhow”.
“A-whole-nother”, in which another (an+other) is reanalyzed as a+nother.