Presponse (noun) - To respond to a question before it is finished,
often confusing the asker.
For Example:
Chevon: So are you avail-
Adair: No. (Presponse)
Chevon: -ible Monday?
(silence)
Chevon: Well? Are you?
Adair: *purses lips and departs*

thanks UBRAN DICTIONARY!