Modifying here (also there). In exactly this (or that) place, in this (or that) very spot. In later use (originally U.S.) frequently, with admixture…

Exactly, precisely, just. Frequently in meet now: just now, at this moment. Now rare (English regional).

Of motion or position. Exactly in a particular direction, position, or alignment; directly, precisely.

With a sudden spring or impetus; slap, smack. right spang, entirely, quite; exactly, fair.

Exactly, precisely; with a smack. Cf. slap-dab, adv.

In or into the very middle of things; = smack, v.2 7b.

Thoroughly, completely; exactly. Originally dialect and U.S., now colloquial.

= slap-bang, adv. (see also quot. 1895). Cf. smack-dab, adv.

With, or as with, a slap and a bang; without delay, immediately; without due consideration or regard to the consequences. Also of position…