Drinking excessively, especially during the week, and staying out until last call. Usually needs to happen more than one consecutive night in order to really count as Flintering, but getting completely blitzed can still qualify. Originates in Ireland.
"Darrach, why do you look so tired? You have a big proposal today!" "Man, I've been Flintering all week. I'm WRECKED!"
From a root form of "flattery" but combined with the context of "flirting" used to describe someone gay being overly friendly with someone straight, but of the opposite sex.
I wanted to talk to that cute girl but that gay guy was to busy fluttering with her, hating on my game.
As if giving butterfly kisses with your balls. Lightly flapping your nuts across her cheek. The feminine version of this word would be butterflap kisses.
Eg. He gave me the flutteringbutterfly so sweetly that a tear rolled down my cheek (or was it pre ejac?).