Someone who is noncommittal or agrees to everything but then never shows up and therein flaky. So flaky to the point of being almost professional in the practice of it. A professional flaky person. Hence, flake-up artist.
e.g.
Ben: "Liv! We haven't met up in ages!! Fancy meeting up this weekend? I'll be in your neck of the woods any how so we should deffo meet up for a crafty drink! You down?"
Liv: OMG! Ben!!! YES. We gotta do this! Bell me when your here and I'll come down!
(24 Hours passes and Ben arrives at agreed location)
Ben: "Hey Liv, I've just arrived! Where abouts are you?
A contraction of "flare-up" and "flaming" (as in homosexual). Briefly becoming very attracted to the same sex, perhaps only while under the influence of drugs or alcohol. In other words, a straight person having a gay moment, or a gay person having an EXTRA-gay moment.
Girl A: "I thought Emma was here with Dave."
Girl B: "She is."
Girl A: "Then why is her tongue down Megan's throat?"
Girl B: "Oops - looks like another flame-up. She had one of those at last year's sorority mixer."
The ability girls and women have developed to hold several items at once in one hand. The skill has been developed due to the lack of pockets in women's clothing.
I thought she'd need multiple trips to carry her phone, keys, wallet, and Starbucks to her car since she needed the other hand to open the door, but she used her impressive girl grip to carry everything in one hand.