/in ter"euh bang'/ , n.
a printed punctuation mark available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Also, interabang .
[ 1965-70, Amer.; INTERRO(GATION POINT) + BANG 1 , printers' slang for an exclamation point ]