catching up

flirting with an acquaintance who you know vaguely at a social situation like a party or bar, and denying accusations of flirting with the mere excuse of you were just reconnecting socially.

Mate 1: Who was that girl you were just talking to?
Mate Accused of Catching Up: Oh just Stacey, haven't seen her since Joey's Halloween Party.
Mate 2: Aye, were you flirting with her?
Mate Accused of Catching Up: No! We were just catching up!