/na-nə-/
[CMU: from nanosecond]
n.
A brief period of time.
"Be with you in a nano"
means you really will be free shortly, i.e., implies what mainstream people mean by
"in a jiffy"
(whereas the hackish use of jiffy is quite different -- see jiffy).
[SI: the next quantifier below micro-; meaning * 10-9]