Green’s Dictionary of Slang

flit v.1

[flit n.2 (1)]

to be a homosexual; thus flitting effeminate.

[US]J. Crumley One to Count Cadence (1987) 239: She came in [...] with a group of white waving hands and flitting voices.
[US]Maledicta IX 177: Increasingly, the general public is hearing private language of films such as Outrageous […] there one heard words such as [...] suck-holes, drag queens, flitting, tacky, fruits, swishing, seafood (sailors), cruise, whore (as a verb).

In derivatives

flitting (adj.) (also flitty)

(US) effeminate.

[US]J.D. Salinger Catcher in Rye (1958) 201: I mean I wondered if just maybe I was wrong about thinking he was making a flitty pass at me.
‘V. Della Strada’ Locker-Room Lovers 11: ‘Sometimes I wonder about Don van Meter. I mean, he’s not flitty or anything’ [Simes:DLSS].
[US]‘S. Rowen’ Choice Chicken 74: ‘[T]hat flitting pansy’ [Simes:DLSS].
‘J. Coriolan’ Smile of Eros 23: Olivia Barber [...] apparently considered her flippant, flitting butterfly of a husband the cutest thing ever [Simes:DLSS].