Webster's Revised Unabridged Dictionary · 1913

wanna

wanna (won"nu) , phrase

[phonetic transcription of colloquial speech, from want to.]

Want to; as, I wanna go home. [colloquial, phonetic spelling]

Phonetic transcriptions of rapid colloquial speech are sometimes used in place of the grammatically proper spelling in order to provide a flavor of the original spirit of a spoken dialogue. See also the related entries for gonna, gotta, and wannabe.

wanna (won"nu*bē`) , noun

[phonetic transcription of colloquial speech, from want to be.]

A person who wants to be or become a different type of person -- what the person wants to be is usually clear from the context; at hollywood and vine one can meet both famous actors and wannabes. [colloquial, phonetic spelling]

Also: wannabe